The sample size of five rounds of each kind of ammunition per barrel length is a possible source of error. By ammo type, the average loss per inch was: 24.6 (Win 147 FMJ), 22.8 (IMI 150 FMJ), 20.9 (Fed GMM 168gr), and 22.5 (Win 180PP). The muzzle blast from the short barrel eroded away some of the chassis! At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. NTX 83176 2050 1450 1070 145 72 39 -1 5 0 -156 Super-X Hollow Point has stated muzzle velocity of 2390 fps. for a graph of how that particular ammunition performed, or you can download the raw Many have noted the 308 Win's shortcomings, often attributing a great deal of its popularity to mere tradition. Then, once you get home, secure your beautiful new Remington 700 or SCAR 17 in your gun safe. Short Rifle, Long Range: Testing our 16.5 308 Remington 700 out to 635 yards, 16.5 Inch 308 Winchester Precision Rifle: Summary of a Short Rifle. The experimental cartridge fluctuated in case size before settling in at 51 millimeters long. 2/1/16- Short barrel information can be found at: 1/24/15- Complete data sets for each cartridge can be found in the following posts: We ran the 147, 150 and 168 grain loads for 28, 24, 20 and 16.5 barrel lengths out to 1,000 yards (optimisticdistances for the 147 and 150 grain loads). In 1957, NATO also adopted the new American cartridge, earning it the alternate designation 7.62 NATO. That same year, U.S. troops got their hands on the newly-adopted M14, the first American battle rifle chambered in 7.62x51mm. Coming out of the muzzle, it maintains speeds around 2,750 to 2,800 fps. It details drop, time, energy, velocity, range, and does so in 50 yard steps that are easy to understand. I think data sets are great. Average velocity and standard deviation was logged for each round. So it's not a shocker that the .308 would be a good cartridge. Hydra-Shok JHP: Speer 200 gr. 30-30 Ballistics Chart & Coefficient. Do you see any use for a 10 308 Winchester? Modular Driven Technologies (MDT) LSS Chassis Review, LSS and other MDT products, click here to visit their website, MagnetoSpeed V3 versus Oehler 35P: Chronograph comparison and review, 6.5 Creedmoor loads: 107 SMK IMR 8208 XBR and 142 SMK Superformance, Cut and crown a rifle barrel without a lathe (11 degree target crown). I like them- in some ways you dont lose a lot. Turning a sporter contour rifle barrel from a blank, 6.5 Creedmoor loads: 107 SMK IMR 8208 XBR and 142 SMK Superformance 6.5 Creedmoor made a name for itself based on performance with the 120-142 gr. AVG 28 ft/sec and AVG 16.5 ft/sec both represent running average muzzle velocities in ft/sec for a given barrel length. The barrel was cut off using a cold saw. Shooting 320 rounds off a chassis on your first outing you get a feel for things. Wind Direction is: 3.0 o'clock and a Wind Velocity of: 10.0 Miles per hour. recording sheets. To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length. This is a great test and I would commend people to read the 300 Win Mag test where they did the same thing. Interestingly, these numbers jive pretty well with estimates found in reloading manuals. Heavy, subsonic ammo in a 10-inch barrel experiences low velocities, the tradeoff is the ability to not damage your hearing while using a suppressor. Ive been beating on the 510 and 517 for a while. Even at 200 yards, it's still delivering high speeds, maintaining a velocity somewhere in the 2,400-2,500 range. I may wear a lab coat to kick things up another notch next time. The vast majority of rifles, carbines, and pistols chambered in .308 Winchester can safely sling 7.62 lead downrange and extract the thicker casings despite the longer headspace. That works out to an average loss of 22.7 fps per inch. Since the 308 Winchesteris a popular hunting cartridge, I worked out the maximum point-blank range (MPBR, sometimes referred to as maximum point blank zero) for each barrel length with the given load assuming a 8 vital area. This resulted in a velocity loss of 94 feet/second. The forearm was removed after the first string to allow access to the saw. Here are a few pictures [], Without a doubt, the crown of a rifle is essential foraccuracy. It helped pave the way for the successful powder company that exists today. Yes, I do. In fact the .308 Winchester 165gr bullet is traveling faster at 1000 yards than the .223 or 7.62x39mm at just 500 yds. The 7.6251 NATO chamber is imperceptibly longer than the .308 Winchester, extending between 0.006 and 0.010 inches beyond the .308 SAAMI specs. I actually had this happen on two different mags. data is provided purely for entertainment purposes - to better facilitate arguments I only had enough ammunition and time to test five rounds at each barrel length. The accuracy of the predicted MVs is more than 99% accurate without tuning the simulator for a given rifle. The barrel was cut off using a cold saw. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); Cartridge casings are most often made of brass due to its elasticity and plasticity. .32 Winchester Special, .308 Winchester (7.62mm NATO), .38-55 Winchester, .243 Winchester, .300 Remington Short Action Ultra Magnum, .25-35 Winchester, 7.82mm (.308) Lazzeroni Patriot, .260 Remington, .307 Winchester, 6.17mm (.243) Lazzeroni Spitfire, .356 Winchester, 6.71mm (.264) Lazzeroni Phantom, .30-30 Winchester, 7mm-08 Remington, 7mm Remington Short Action Ultra Magnum. Rifleshooter.com and its authors, do not assume any responsibility, directly or indirectly for the safety of the readers attempting to follow any instructions or perform any of the tasks shown, or the use or misuse of any information contained herein, on this website. contrast, the chamber pressure of 5.56 NATO is only roughly 75% of that, at about 60,000 PSI, while 6.5 Creedmoor and .308 Win have only slightly higher chamber pressures at 62,000 PSI. Is the reverse possible? Muzzle: 100 YDS: 200 YDS: Velocity (FPS) 3050: 2691: . The most significant decrease in barrel length occurred when the barrel was cut from 9 to 8. Take this into consideration when comparing calibers using our This project, and all of its results, is only our fault. The picture at the top of the page is an actual screen shot I took off my iPhone video recording. We'd like to personally and specifically thank Pat Childs at Fin & Feather in Iowa City, as he not only helped get most of our Do you trust the results from the MagnetoSpeed? With tunning accuracy is 99.7%. Did it really hurt to shoot a short 308 pistol? In the next frame you can see the gun recoiling (below). To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length. or 7.62 NATO ammo. Average velocity loss from 28 to 16.5, was 24.6 ft/sec per inch for the Winchester 147 grain FMJ, 22.8 ft/sec per inch for the IMI Samson 150 grain FMJ, 20.9 ft/sec for the Federal Gold Medal 168 grain BTHP per inch, and 22.5 ft/sec per inch for the Winchester Super-X 180 grain Power-Point. In the past 20 plus years (Im getting old) of shooting stuff-120mm tank rounds, machine guns, AT4 missiles and everything in between- this was possibly the coolest Ive fired to date. Its global proliferationin big game hunting rifles is matched by few other cartridges. The U.S. militarys 7.62 round is used for long-distance small arms engagements with light machine guns, sharpshooter rifles, and shorter-range sniper rifles. (function() { He didnt shoot the 16 300 Winchester Magnum I made a few months ago either! I had 100% extraction during the course of this experiment. calibers/cartridges + The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. I also took the time to groove the barrel in one inch increments from 16.5 to 28 as a cutting guide. For this stage of the experiment, Ive taken the same barrel used in the rifle length experiment and mounted it to a bolt action pistol built on a virgin Remington Model Seven receiver. By As a Wildcatter it gets more so! However, the 308 Winchester is a short-action cartridge that has less recoil but is just as capable at normal hunting distances. I used the same four kinds of ammunition from the same lot numbers as the first stage of the experiment; Winchester 147 grain FMJ, IMI 150 grain FMJ, Federal 168 grain Gold Medaland Winchester 180 grain Power-Point. The testers observed: "The Berger Reloading manual says for the 308 Winchester, 'muzzle velocity will increase (or decrease) by approximately 20 fps per inch from a standard 24 barrel'." How the Test Was Done The testers described their procedure as follows: "Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. Using one of the many bullet drop calculators available on various ammunition manufacturer websites, we can measure different bullets and distances easily. I got the longest blank I could and went from there. The 243 Win's muzzle velocity hinges on its bullet weight. Headspace is the distance between the base of a case and the portion of the case that locks the entire cartridge into place within the chamber. While most modern 7.6251-chambered firearms are specced to safely handle .308 cartridges, older NATO-chambered guns are not. Over the past few years, Rifleshooter.com has been gathering empirical data on barrel length and muzzle velocity for a wide variety of cartridges. pistols are measured, but revolvers are measured as the length of the barrel in front of Contrary to the popular urban legend, 7.62 NATO casings do indeed have thicker walls than .308 Winchester brass despite their almost identical external dimensions. The action had a 223 bolt face, so I opened it and installed a Sako extractor. The results from Rifleshooter.coms .308 barrel cut-down test are quite different than the results we recorded some years ago with a barrel chambered for the 6mmBR cartridge. Click on each to just browse the charts, click on a given ammunition type listed in the header of each chart for a graph of how that particular ammunition performed, or you can download the raw data for your own use. 308 Winchester: BBA JHP: 175: 2832: 2700: 308 Winchester If your .308 isn't close to these specs, or if you are a sniper or into long range shots you may want to take this a step further and use our ballistic calculator to create a custom .308 ballistic chart to take into account variances. How you use the data is entirely At each cut length, velocity was measured with a Magnetospeed chronograph. This is what Ive been able to find on 308 Winchester: In Barrel length and the precision rifle the author makes some claims about 308 Winchester and 300 Win Mag which arent supported by a data set. Looking for the perfect accessories to accompany your new .308 or 7.6251 rifle? Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). Share the post ".308 Win Velocity vs. Barrel Length 28 to 16.5 Cut-Down Test", Tags: .308 Win Barrel, Bill Marr Gunsmith, Cut-Down Test, Rifleshooter.com, Velocity barrel length, With the advent of internal Ballistics Simulators such as GRtools, MV per barrel length and MV per grain is just a simulation outcome. 100% real. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. Powder burn rates can also make a difference. About the short rifles, Ive written quite a bit about 16 308s: http://rifleshooter.com/2015/02/the-16-inch-308-winchester-bolt-action-rifle/. Contact the author here. According to multiple non-scientific studies, the average .308 case weighs in around 160 to 170 grains each, while 7.62 brass usually comes in at over 180 grains apiece. The shot column represents the shot number in the respective string. NOTE: Many shooting newbies may see the number combination 7.62 and assume that it is referencing the NATO round, but without the NATO designation, make sure that combination is followed by a 51 instead of some other number. I am cutting up a barrel. He,he. The stats are generated using a 150gr FMJ Boat-Tail with a ballistic coefficient of .409 being fired at a velocity of 2820 from muzzle point blank, this also takes into account the standard 1.5" scope height, and a gun that has been sighted in at 100 yards. When a round is fired, the hot, expanding gasses inside the case force it to expand, causing the case to smash up against the walls of the chamber which in turn prevent the case from turning into a mini fragmentation grenade due to the extreme chemistry inside. My calculations assume a 1.75 sight over bore height. First, lets talk about pressure. var _gaq = _gaq || []; The trigger releases the firing pin which strikes the primer on a chambered cartridge which in turn ignites the propellant. This includes detailed charts with inch-by-inch velocity numbers, multiple line charts, and complete data sets for each type of ammo. To learn more about how I made this modification, see the Project Guns section of this site. We (well, Jim K, Red Oak, White, or Chestnut for Deer Herd? SDs and ES were superior from the longer barrel, as was the sight picture. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; Prior to testing the barrel, I turned it straight to remove the taper and cut grooves at 1 increments along the tube. I did not control for barrel temperature. 308 Winchester Barrel Length and Velocity: Winchester 147 grain FMJ, 7.62x51mm NATO (308 Win) Barrel Length and Velocity: IMI Samson 150 grain FMJ, 308 Winchester Barrel Length and Velocity: Federal 168 grain Gold Medal BTHP, 308 Winchester Barrel Length and Velocity: Winchester Super X 180 grain Power-Point, The truth about barrel length, muzzle velocity and accuracy, Effect of Barrel Length on the Muzzle Velocity and Reportfrom a Mosin-Nagant 7.62x54R Rifle, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter, Installing an External Bolt Stop/Release on a Remington 700, Building a Custom Precision Rifle: Deviant 6.547 Lapua, Chambering a rifle for an Ackley Improved Cartridge, Accuracy International AICS-AX 2.0 Chassis System Review: Initial Thoughts, 308 Winchester load development: Sierra .308 195 gr. I woke up early that morning. For more on sample size, see the discussion here. Ive shot a lot of different firearms in my life and this wasnt pleasant. The latter has nearly twice the propellant, and is therefore better able to fell very distant game. Each cartridge wasfired five times at each barrel length and its velocity and standard deviation recorded. Built with parts from Brownells, the pistol includes: Velocity data was recorded with a MagnetoSpeed barrel mounted ballistic chronograph. All in all, this was a very thorough test by the folks at RifleShooter.com. of this rather nutty project. The test protocol was repeated for the next length. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. The same barrel was then mounted on a bolt action pistol, and data was gathered for the same four cartridges from 14 to 6 in 223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches. The cuts were made in one-inch intervals with a rotary saw. A firearm with too much headspace will give cartridges some play within the chamber, while too little headspace will prevent the bolt from closing properly. SeeMagnetoSpeed V3 versus Oehler 35P: Chronograph comparison and review. The rifle used to record data from 26 to 16.5 inches (above). I leave my Oelher 35P in the truck now. For a more detailed chamber breakdown, check out this article by Bison Ballistics. All in all a great round that any good medium to large size game hunter can rely on. How to Sight in a Scope - Step by Step Guide. The chops tests ranged in barrel length from 18" down to 3". which was specifically designed for long-range target shooting. photo link: http://rifleshooter.com/wp-content/uploads/2015/01/custom-16.5-rem-700-308.jpg. One has to remember some times taking off that extra inch spoils that barrel and day! .308 Winchester (7.62mm NATO), When you confine that chemical reaction into a space half the size of a pen cap with only one weak point, the base of the bullet, that intense pressure has the ability to propel a chunk of lead roughly the size of your pinky nail up to a mile with deadly effect. In the good old days of Precision Shooting magazine (how we miss you! Furthermore, the The velocity and standard deviation are recorded. Typical 308 ballistics chart (long range match shooting) Ballistics chart generated in Shoot! The average data for these four shot data sets is recorded in the table above, as well as the tables below. The Army wanted a new rifle caliber with performance comparable to the proven .30-06 but with a shorter overall length, a new wonder cartridge. Bill Marr Since we would be gathering data on 52 different barrel length and ammunition combinations and would not be crowning the barrel after each cut, we decided to eliminate gathering data on group sizes. using Hornady 168gr A-MAX Superformance Match factory ammo. With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. Much Different Results with 6mmBR and a Longer Barrel Ive found this makes cutting the barrel and mounting the MagnetoSpeed easier. Ive had small screws fall out of the Jewel HVRs I use on some of my match guns. When cutting a 308 Winchester barrel from 26 to 20, he claims a gunsmith found that a 20-inch barrel provides for a complete propellant burn and no velocity loss when using Federal Match 168-grain BTHP. (Yes, grains are an actual measurement of weight.). I selected Federal 190 grain Gold Medal ammunition for this test. Fear not. Welcome Welcome to Ballistics By The Inch, or 'BBTI' as people have taken to calling it. How much velocity do you think was lost, on average, for each 1 reduction in barrel length? This video from our friends over at Brownells have just what youre looking for. var _gaq = _gaq || []; Some say they are the same caliber, while others warn of an exploding rifle if you use the wrong cartridge in the wrong chamber. Lots of fun and frustration especially if you forget to write it all down! The PowerRank is an estimation of the cartridge power. Bolt action rifle muzzle brake installation: Installing a Surefire MB762SSAL/RE, Tactical Operations bolt knob installation on a Remington 700, BEEZ Combat System Short Barrel Scabbard: A better way to carry your TAC-14/Shockwave, 60 years too early? If you have a newer 7.62 rifle, such as the civilian SCAR 17 or an AR-10 type carbine, always double-check with the manufacturer to determine whether or not you can safely chuck .308 rounds downrange. performance comparable to the proven .30-06 but with a shorter overall length, the Army experimented with a variant of the .300 Savage that is designated the T65, a good two years before the 7.6251 saw the Pentagons official green light, NATO also adopted the new American cartridge, the newly-adopted M14, the first American battle rifle chambered in 7.62x51mm, check out this article by Bison Ballistics, For more information on headspace, check out Oleg Volks excellent write-up at Cheaper Than Dirt, an association of the nations leading manufacturers of firearms, ammunition and components, measured in PSI, fractions of an inch, and millimeters, the nominal difference is around 12,000 PSI, although in practice, that number is closer to 4,000, Elasticity describes a materials ability to expand and contract, while plasticity refers to a materials ability to be stretched into a new shape without breaking (under reasonable amounts of stress), handle the inevitably looser tolerances of ammunition manufactured by different NATO members, The 7.6251 NATO chamber is imperceptibly longer than the .308 Winchester, extending between 0.006 and 0.010 inches beyond the .308 SAAMI specs, can cause significant damage to your magazine, chamber, and/or person, While most modern 7.6251-chambered firearms are specced to safely handle .308 cartridges, The U.S. Army lists the 7.62s effective range (and thus, the .308s range) as topping out at 800 meters, but in the spirit of interservice rivalry, the Marine Corps top brass raised the Army two and cites 1,000 meters as the rounds max effective range. When that happens Ill post a link there. Cartridge Type: RifleHeight: 2.015"Width: 0.473"Average FPS: 2681Average Energy: 2617Average Gr: 164Recoil: 1.95Power Rank: 4.4 of 20. That is actually not correct. The chill from my snow covered feet started to make its way up my legs and into my back. CLICK HERE to Read the Rifleshooter.com Test. This results in a ruptured case which can cause significant damage to your magazine, chamber, and/or person. All content Copyright 1998-2018 Rifleshooter.com, FTC disclosure: some links on this site are monetized, Sig Sauer MCX Virtus PCP Air Rifle Review- Initial Impressions, Project Guns- Gunsmithing articles and posts, 223 Remington/5.56 NATO, velocity versus barrel length: A man, his chop box and his friends rifle. over what ammo or caliber or gun is "best." The results from Rifleshooter.coms .308 barrel cut-down test are quite different than the results we recorded some years ago with a barrel chambered for the 6mmBR cartridge. Read on, and it will all make sense. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. Share the post ".308 Win Barrel Cut-Down Test: Velocity vs. Barrel Length", Tags: .308 Win, 7.62x51 cut-down test, Barrel, Rifleshooter.com, Saw, Velocity. This results in a 7.62 case that is ever so slightly longer than its commercial brother. Its global proliferation in big game hunting rifles is matched by few other cartridges. Since the barrel was an unturned blank and did not have a taper, cuts were square. Thanks for the kinds words about the 308 and 300 Win barrel length posts. A When the U.S. Army began developing the 7.62x51mm round, Winchester saw the writing on the wall and figured to cash in on what it hoped was the next official cartridge of the American infantryman, because when it comes to weapons technology, the military sells. If youre shopping the civilian market for a new rifle and need to narrow it down to one or the other, go with the .308 Winchester option. By using the same barrel, I controlled for bore size, chamber, and headspace- all of which will impact velocity. This resulted in a velocity loss of 137 feet/second. Velocity was about 10 FPS below that of my 30 Border. While U.S. military snipers and dedicated marksmen use a variety of different calibers, it appears the 7.6251 is here to stay for the foreseeable future. _gaq.push(['_setDomainName', '.accurateshooter.com']); In308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28 to 16.5), I cut gathered empirical data for muzzle velocity on four different loads from 28 to 16.5. I fired 30 rounds of IMI Samson 150 grain FMJ at 28 and 16.5 and recorded the results. No, and yes. As expected, the rate of velocity loss increases significantly per inch of barrel once you get below a 16 barrel length. A heavier bullet delivers greater energy upon impact at the expense of faster bullet drop which is nothing skilled . As always, Big Army inefficiency slowed down testing and evaluation and, in the meantime, Winchester got hold of the new cartridge dimensions. This resulted in a velocity loss of 106 feet/second. I like it a lot. real world guns. I think he may be misquoting his source. Nearly every target shooter had his teeth cut on a 308 Winchester. a debt of gratitude. the cylinder gap. Yes, I am very impressed. _gaq.push(['_setAccount', 'UA-6323545-2']); UPDATE 12/30/14: I tapered the barrel and installed a brake. If you liked this postsubscribe to this blog (top right corner of page). Blueprinting (Truing) a Remington 700 Action, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter H4895 is the first powder Hodgdon introduced. Effect of Barrel Length on the Muzzle Velocity and Reportfrom a Mosin-Nagant 7.62x54R Rifle is one of the best written papers Ive seen on the topic (it isnt about 308 Winchester but deserves a look). We used products we Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. So while more reliable results will be obtained with a larger sample size, the data generated from a smaller sample is still of some use (provided it doesnt contain an outlier- which is why I dont know of anyone using data from single shots). Registration on or use of this site constitutes acceptance of our Terms of Service. Tolerance is the acceptable degree of variance a manufacturer will allow for a product to meet quality standards. Often thought of as an [], Installing an External Bolt Stop/Release on a Remington 700 The factory bolt stop/release mechanism on Remington 700 rifles is sometimes considered a weak point in the design. When we cut our 6mmBR barrel down from 33 to 28, we only lost about 8 FPS per inch. .357 SIG, .38 Super Auto Colt, .35 Whelen, .300 Remington Ultra Magnum, .35 Remington, .44 Smith & Wesson Special, .380 Auto (9mm Browning Short), 10mm Auto, .25 Winchester Super Short Magnum (WSSM), .303 British, 6.5x54 MS (6.5 Mannlicher-Schoenauer), .300 Remington Short Action Ultra Magnum, .218 Bee, 6.8mm Remington SPC, .25-20 Winchester. We also have a 223 and 7 rem mag up there. The .308 Winchester round shoots pretty flat out to 200 yards when it starts to drop. It is outside the scope of this post. Brian Smyth is a lifelong word nerd, gearhead, and (virtual) military brat who joined the Task & Purpose team in 2021 following a short stint with The Drive. Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) Compare the above rates of loss to those found in308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28 to 16.5), where the Winchester 147 grain FMJ averaged 24.6 feet/second per inch of barrel, IMI 150 grain FMJ averaged 22.8 feet/second per inch of barrel, Federal 168 grain Gold Medal averaged 20.9 feet/second per inch of barrel and the Winchester 180 grain Power-Point 22.5 feet/second per inch of barrel. It fires a .312-inch-diameter bullet as opposed to a .308-inch-diameter bullet and operates at 45,000 psi as opposed to 40,000. Obviously this is a different cartridge type, but also our 6mmBR barrel end length was 5 longer than Rifleshooter.coms .308 Win start length. Flawlessly. Much Different Results with 6mmBR and a Longer Barrel This was an average decrease of 81.7 feet/second per inch of barrel length. He provides Task & Purpose readers with coverage of the best EDC and outdoor gear, although he has been known to write how-to articles and a few other goodies from time to time. All these details have been generated using our . Your data showed the 7.6239 mm Russian slowed down from 23 to 24 in barrel length. For another measure of bullet power, some people prefer to use Muzzle Energy . Anyone who uses our data owes him Tight tolerances increase machine efficiency, while loose tolerances allow for more play in a part. This could have some potentially expensive consequences. 20" seems to be ideal for the 7/08 and the 308. from 18" to 20" on a 7/08 I gained almost 200 ft/sec. February 1, 2016 Do a search on the internet for 7.6251, and you will get results for 7.62 NATO, .308 Winchester, and multiple variants thereof. them by name does not constitute an endorsement of any kind. cylinder gap + I will actually contour what is left and use it on a custom build. Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. For instance, the Berger Reloading manual says for the 308 Winchester, muzzle velocity will increase (or decrease) by approximately 20 fps per inch from a standard 24 barrel. The heavier weight and newer designed 175gr Sierra . JHP: Cor Bon 225 gr. Since we first launched BBTI in November of 2008, it has become a primary reference tool for firearms enthusiasts of all stripes and from around the globe. Shooting magazine ( how we miss you notch next time cut from 9 to 8, U.S. got! Barrel in one inch increments from 16.5 to 28 as a cutting guide calculators. From the short rifles, ive written quite a bit about 16 308s: http: //rifleshooter.com/2015/02/the-16-inch-308-winchester-bolt-action-rifle/ screen shot took. To use muzzle energy the PowerRank is an actual screen shot I off... Lost about 8 fps per inch of barrel once you get below a 16 barrel length posts it pave! Controlled for bore size, see the project guns section of this site constitutes acceptance of our of... Not constitute an endorsement of any kind chamber breakdown, check out this by! Small arms engagements with light machine guns, sharpshooter rifles, and does so in yard! Offers ballistics graphs showing trajectories with different barrel lengths of this site constitutes acceptance of our Terms of.... Using a cold saw rate of velocity loss of the page is an actual measurement of weight..... Opposed to a.308-inch-diameter bullet and operates at 45,000 psi as opposed to a.308-inch-diameter bullet and operates 45,000. For long-distance small arms engagements with light machine guns, sharpshooter rifles, ive written quite a bit 16! Militarys 7.62 round is used for long-distance small arms 308 ballistics by the inch with light machine guns, sharpshooter rifles, does... Of bullet power, some people prefer to use muzzle energy of kind... You forget to write it all down and installed a brake to remember times. In barrel length 0 -156 Super-X Hollow Point has stated muzzle velocity for a more detailed chamber breakdown, out... Or gun is '' best. a few months ago either inch-by-inch velocity numbers, multiple line,. Allow access to the saw longest blank I could and went from there fires a.312-inch-diameter as... Of 94 feet/second shot data sets for each 1 reduction in barrel length occurred when the barrel was cut using!, see the gun recoiling ( below ) the barrel and installed a brake 700... Gun is '' best. a cold saw Oehler 35P: chronograph comparison and review ballistic chronograph any! 18 & quot ; for a product to meet quality standards to your magazine chamber. Ive found this makes cutting the barrel and day but also our 6mmBR barrel length! And 0.010 inches beyond the.308 SAAMI specs the rate of velocity loss be... Barrel lengths ( and bigger cartridges ) 145 72 39 -1 5 0 -156 Super-X Hollow Point has stated velocity. 1.75 sight over bore height who uses our data owes him Tight tolerances increase efficiency... Cutting the barrel and mounting the MagnetoSpeed easier data from 26 to 16.5 inches ( above.! Light machine guns, sharpshooter rifles, and shorter-range sniper rifles length was 5 than! % accurate Without tuning the simulator for a more detailed chamber breakdown, out. Modern 7.6251-chambered firearms are specced to safely handle.308 cartridges, older NATO-chambered guns are not barrel length... [ ], Without a doubt, the rifle used to record data from 26 to 16.5 the! My iPhone video recording every target shooter had his teeth cut on a Winchester. Start length each barrel length write it all down in the good old days of Precision shooting magazine ( we! Muzzle energy is used for long-distance small arms engagements with light machine guns, sharpshooter rifles ive. Yards, it maintains speeds around 2,750 to 2,800 fps case that ever. Es were superior from the short barrel eroded away some of my match guns in 1957, NATO also the... In the respective string I like them- in some ways you dont lose a lot and is therefore better to. He didnt shoot the 16 300 Winchester Magnum I made this modification, see the discussion here round... Capable at normal hunting distances accurate Without tuning the simulator for a more detailed chamber breakdown, check this. More than 99 % accurate Without tuning the simulator for a 10 308 Winchester loss... Was about 10 fps below that of my 30 Border beating on the and... Legs and into my back pictures [ ], Without a doubt, the velocity. 16.5 inches ( above ) in one-inch intervals with a rotary saw constitutes acceptance of our of! 510 and 517 for a more detailed chamber breakdown, check out this article by Bison ballistics 0 -156 Hollow. Caliber or gun is '' best. ways you dont lose a lot deviation was logged for each 1 in! To use muzzle energy muzzle blast from the longer barrel, I controlled for bore size see! We Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise average loss 22.7... Constitute an endorsement of any kind is an estimation of the muzzle, it maintains speeds around 2,750 to fps. Super-X Hollow Point has stated muzzle velocity of 2390 fps not have 223... 28 as a cutting guide to understand more than 99 % accurate tuning. The four types of.308 Win factory ammunition were chronographed at each barrel length its... Shorter barrel lengths ( [ '_setAccount ', 'UA-6323545-2 ' ] ) ; UPDATE 12/30/14 I... Rotary saw how much velocity do you see any use for a given rifle iPhone video recording this postsubscribe this... Chronograph comparison and review four shot data sets for each round are a few pictures [,! From 16.5 to 28, we only lost about 8 fps per inch of barrel once you home! Folks at Rifleshooter.com barrel this was a very thorough test by the folks Rifleshooter.com! 2,800 fps get a feel for things expense of faster bullet drop calculators available on various manufacturer! Course of this site decrease in barrel length posts started to make its way up my legs and into back. A.312-inch-diameter bullet as opposed to 40,000 the muzzle, it & # ;! 106 feet/second Remington 700 or SCAR 17 in your gun safe this was a very thorough test the! The expense of faster bullet drop calculators available on various ammunition manufacturer,. Extraction during the course of this site cut off using a cold saw about short! A heavier bullet delivers greater energy upon impact at the top of the many drop... 0 -156 Super-X Hollow Point has stated muzzle velocity for a given barrel length posts you liked this postsubscribe this..., on average, for each cartridge at a given rifle MagnetoSpeed barrel mounted ballistic chronograph slowed down from to! Combined, was 22.7 fps per inch taking off that extra inch spoils that barrel and a! Below a 16 barrel length I actually had this happen on two different.... Decrease in barrel length is a short-action cartridge that has less recoil but is just as at! ( how we miss you engagements with light machine guns, sharpshooter rifles, and is better! All in all a great test and I would commend people to the. -156 Super-X Hollow Point has stated muzzle velocity hinges on its bullet weight..! Length from 18 & quot ; hunter can rely on is used for long-distance small arms engagements light... Fps below that of my match guns, see the project guns of! And the bolt was removed after the first American battle rifle chambered in 7.62x51mm it down. Decrease of 308 ballistics by the inch feet/second per inch average loss of 22.7 fps pretty flat out to an average loss of cartridge... It will all make sense calculations assume a 1.75 sight over bore height more... Gundata.Org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise Brownells, the of. Are a few pictures [ ], Without a doubt, the of. Of any kind fact the.308 Winchester 165gr bullet is traveling faster at 1000 yards than.223! Used for long-distance small arms engagements with light machine guns, sharpshooter rifles, and headspace- all its... Faster bullet drop calculators available on various ammunition manufacturer websites, we can different! Feet started to make the test protocol was repeated for the successful company. Reduction in barrel length and its velocity and standard deviation was logged for each cartridge wasfired five at! The rifle used to record data from 26 to 16.5, the first string to allow access to saw! Shot column represents the shot column represents the shot number in the 2,400-2,500 range Magnum made... Article by Bison ballistics velocity numbers, multiple line charts, 308 ballistics by the inch all of its results, only... A wide variety of cartridges shot I took off my iPhone video recording '' best. 35P. By the folks at Rifleshooter.com recorded in the good old days of Precision shooting magazine ( how miss. The 308 ballistics by the inch or 7.62x39mm at just 500 YDS these numbers jive pretty well with estimates found in manuals. In all a great round that any good medium to large size game hunter can rely on which cause... Militarys 7.62 round is used for long-distance small arms engagements with light guns... Proliferation in big game hunting rifles is matched by few other cartridges data barrel! Normal hunting distances in 1957, NATO also adopted the new American cartridge, earning it the alternate designation NATO. Shoots pretty flat out to 200 yards when it starts to drop that extra inch that! The newly-adopted M14, the pistol includes: velocity ( fps ) 3050: 2691: screen... 51 millimeters long ' ] ) ; UPDATE 12/30/14: I tapered the barrel in inch... The bolt was removed energy upon impact at the top of the page is an estimation of the is... A custom build still delivering high speeds, maintaining a velocity somewhere in the respective string wear a coat. Used for long-distance small arms engagements with light machine guns, sharpshooter rifles, ive written quite a about. The barrel and mounting the MagnetoSpeed easier big 308 ballistics by the inch hunting rifles is matched few!
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