Thanks for the kinds words about the 308 and 300 Win barrel length posts. using Hornady 168gr A-MAX Superformance Match factory ammo. Increasing this sample size would increase the reliability of these results. At 55 grains, its bullet achieves 3,910 fps; at 100 grains, 2,960 fps. 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. The most significant decrease in barrel length occurred when the barrel was cut from 14 to 13. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. Your data showed the 7.6239 mm Russian slowed down from 23 to 24 in barrel length. A. February 1, 2016 This means that when you pull the trigger, 7.6251 brass expands less outwardly but farther toward the chamber. With F Open shooting it does take a lot of testing over a long time to come up with the sweet spot of barrel length for one powder type for barrel, bullet brand/weight/and design alone. He didnt shoot the 16 300 Winchester Magnum I made a few months ago either! For example in this chart I lowered the velocity to . My 16.5 308 Winchester (above) is a fun little rifle. Stay safe, yall! This chart shows velocity changes for all four ammo varieties: Summary of Findings: Initially we intended to test both 9mm and .45ACP cartridges for this sequence. For instance, if I compared the data from row 1, or one shot from the 28 barrel and one shot from the 16.5 barrel, I would have calculated a total change in velocity of 254 ft/sec, and an average of 22.1 ft/sec per inch. I think he may be misquoting his source. The 243 Win's muzzle velocity hinges on its bullet weight. Flawlessly. I leave my Oelher 35P in the truck now. Velocity loss per inch of barrel was .6 ft/sec away (22.8 ft/sec)from the value calculated with 5 shot strings. This allows it to keep a supersonic muzzle velocity at 1,000 yards. My ears were ringing for a long time after the test, I shot it wearing double ear protection and without overhead covered. While you can get close estimates to anticipated velocities by examining anecdotal accounts from different shooters and looking over load manuals, the data gathered in an actual experiment provides a baseline that can help inform your decision making process. _gaq.push(['_trackPageview']); Read on, and it will all make sense. This is especially useful for hunters, of who many, will hold center mass of a vital area on game and dont want to dial in a correction. The thing I found most interesting , is the lines show the consistency of the ammunition ! Click Obviously, the amount of pressure a thin-skinned brass or steel casing can withstand is incredibly immense. You can find The barrel length for a 308 can be anywhere from 16 to 24 inches, while the barrel length for a AK-47 in caliber is typically 16 inches. Mag. If you were paying attention in Mr. Rentons chemistry class, youd remember that when things burn, they create heat and hot gasses. 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. There are some newer bullet designs that have become popular as of late that effectively extend the life and range of the 7.62x51mm NATO/308 Winchester even further. 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/. 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 ammunition and other supplies, he was the brilliant gunsmith who worked with us to make this insane project much more practical.Without his help all of this would have been much more difficult and perhaps impossible. This was noticeable from 19 inches and below. The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. The cartridge case (a.k.a. While most modern 7.6251-chambered firearms are specced to safely handle .308 cartridges, older NATO-chambered guns are not. The 300 Blackout's sleeker bullet has a higher ballistic coefficient than the 5.5645, but with less speed its trajectory invariably arcs more sharply. One note: in every case with the T/C Encore the length of the barrel 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. .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. 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). 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). Since muzzle velocity is dependent on pressure, temperature and volume, I attempted to control as many variables as possible given my setting and equipment. Compare that to a 5.56 Ball M193 round's 55 grain bullet, which delivers a . MagnetoSpeed barrel mounted ballistic chronograph. Cutting the barrel from 28 to 16.5 resulted in a velocity reduction of 283 ft/sec for the Winchester 147 grain FMJ, 262 ft/sec for the IMI Samson 150 grain FMJ, 240 ft/sec for the Federal Gold Medal 168 grain BTHP, and 259 ft/sec for the Winchester Super-X 180 grain Power-Point. home + 7.62 NATO (a.k.a., 7.62x51mm) and .308 Winchester are two very common rifle cartridges commonly used by U.S. service members and civilians. 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? The contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only. Lots of fun and frustration especially if you forget to write it all down! 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. Whether the shooter is stretching his rifles legs on F-Class competition or competing in a Tactical Rifle match, an accurate rifle helps a shooter achieve []. _gaq.push(['_setDomainName', '.accurateshooter.com']); photo link: http://rifleshooter.com/wp-content/uploads/2015/01/custom-16.5-rem-700-308.jpg. This was an average decrease of 60.7 feet/second per inch of barrel length. Do you see any use for a 10 308 Winchester? Shooting 320 rounds off a chassis on your first outing you get a feel for things. 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. They were fairly close. Take this into consideration when comparing calibers using our Bill Marr 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. them by name does not constitute an endorsement of any kind. .308 Winchester (7.62mm NATO), We also have a 223 and 7 rem mag up there. 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 Remington Model Seven Actions are available! Compare the above rates of loss to those found in 308 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 This could have some potentially expensive consequences. 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 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., The testers described their procedure as follows: Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. up to you. The forearm was removed after the first string to allow access to the saw. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; This project, and all of its results, is only our fault. Good ergonomics, and a great value for the money. Red Oak, White, or Chestnut for Deer Herd? He declined. Like the 5.56 versus .223 comparison, understanding the differences between 7.6251 NATO and .308 Winchester is an exercise in patience that has the potential to save you and your wallet some pain and agony. The most significant decrease in barrel length occurred when the barrel was cut from 8 to 7. on each to just browse the charts, click on a given ammunition type listed in the header of each chart I got the longest blank I could and went from there. ga.src = ('https:' == document.location.protocol ? For another measure of bullet power, some people prefer to use Muzzle Energy. 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. We did all the work. cylinder gap + Its global proliferation in big game hunting rifles is matched by few other cartridges. Get the latest in military news, entertainment and gear in your inbox daily. 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 308 Win's .308" bullet is commonly available in 150, 165, and 180 grain weights, which are substantial enough to make short work of a great variety of game. To learn more about how I made this modification, see the Project Guns section of this site. Built with parts from Brownells, the pistol includes: Velocity data was recorded with a MagnetoSpeed barrel mounted ballistic chronograph. In the following cases, Winchester 147 grain FMJ 12, Federal 168 grain Gold Medal 12 and 9, and Winchester 180 grain Power-Point 11, the chronograph only recorded 4 shots of the five shot string. Winchesters fiber wrapped Win-Lite shotgun barrels, Custom 1911 Project: Part 3- fit and blend grip safety, Remington Model Seven (Model 7) Versus The Model 700, 6.5 Creedmoor load development: 142 grain Sierra MatchKing with Reloader 17 and W760, 6.5 Grendel loads in a Howa MINIACTION (6.5 Grendel load development), Rifleshooter.coms 50-25-7 Practical Carbine Standard, Installing a recoil pad on a fiberglass stock, Review: Lithgow Arms LA102 Crossover Centerfire rifle, Replacing a plastic recoil pad on a shotgun, Building a 300 Winchester Magnum Precision Rifle, 5 Quick Tips for Applying Cerakote to Firearms, My bolt wont close! The cuts were made in one-inch intervals with a rotary saw. Cut from 14 to 13 four ammo types combined, was 22.7 fps cartridges, older guns! Given barrel length occurred when the barrel was.6 ft/sec away ( 22.8 ft/sec ) the... When you pull the trigger, 7.6251 brass expands less outwardly but farther toward the chamber the velocity to protection! 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