The Winchester 147 grain FMJ and IMI Samson 150 grain FMJ both showed little reduction in velocity as the barrel was cut from 28 to 26. I woke up early that morning. Good ergonomics, and a great value for the money. Dig around some, and youll likely find yourself scratching your head, wondering what the difference is between 7.62 and .308 rounds. And more importantly, will one blow up a gun in your face when used in the other? I shook vigorously from head to toe. I think the value of this data is worth the time, effort and expense. When looking at .277 Fury's ballistics, . A heavier bullet delivers greater energy upon impact at the expense of faster bullet drop which is nothing skilled . 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. Powder burn rates can also make a difference. Prior to testing the barrel, I turned it straight to remove the taper and cut grooves at 1 increments along the tube. With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. 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. Ballistics Rifle Ballistics Ammo Description Velocity (fps) Energy (ft/lb) Trajectory Tables (inches) CARTRIDGE BULLET ITEM # MUZ 100 yd 200 yd 300 yd 400 yd 500 yd MUZ 100 yd 200 yd 300 yd 400 yd 500 yd MUZ 100 yd 200 yd 300 yd 400 yd 500 yd V 17 Mach 2 15.5 gr. At the urging of the federal government, the Small Arms and Ammunition Manufacturers Institute (SAAMI) was founded in 1926 as an association of the nations leading manufacturers of firearms, ammunition and components. The organization is tasked with creating, standardizing, and publishing technical firearms and ammunition data in order to promote quality, reliability, interchangeability, and safety within the firearms manufacturing and shooting communities. and do the work and publish your own results. Unlike older cartridges such as the 308 [], As stated in my M45A1 review, write USMC on something and Ill buy it. Then, once you get home, secure your beautiful new Remington 700 or SCAR 17 in your gun safe. The bullet does not drop below the speed within . I think cutting the same barrel is preferable over comparing different barrels of different lengths. 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, 308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28 to 16.5), 223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches. Nearly every target shooter had his teeth cut on a 308 Winchester. 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. Temperature was 47 F.. This was an average decrease of 77.6 feet/second per inch of barrel length. The muzzle blast was so violent, it chopped open my Edgewood bag when it got too close. _gaq.push(['_trackPageview']); 7.62 NATO chambers are designed to handle slightly lower pressure rounds with thicker case walls and a longer headspace. Wind Components are (Miles per Hour): DownRange: 0.0 Cross Range: 10.0 Vertical: 0.0. In addition to riding on the back of the 7.62 NATOs short-lived military career, the .308 took advantage of its ballistic and performance similarities to the already venerated .30-06 Springfield, the cartridge that won two world wars and held the line in Korea. Create Your Free Custom Ballistic Report Liked this? The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. All shooting was done from a bench, with a Sinclair rest and rear bag. Would be more interesting to see maybe 35 barrel down to 28 Have always heard that barrels quit increasing in velocity after 34. . If I wanted to expand this to a 10 shot sample,I would simply look at row 10 and find a total change of 265 ft/sec and average loss of 23.0 ft/sec per inch of barrel. Each cartridge wasfired five times at each barrel length and its velocity and standard deviation recorded. For antelope hunters on the Wyoming plains and snipers providing overwatch in the Hindu Kush, there is no difference. ALL Bulletin content is copyrighted, 2023 AccurateShooter.com. them by name does not constitute an endorsement of any kind. For another measure of bullet power, some people prefer to use Muzzle Energy. Super-X Hollow Point has stated muzzle velocity of 2390 fps. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). Its global proliferationin big game hunting rifles is matched by few other cartridges. Of course, this all takes place within mere fractions of a second. 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. I just touched off a 308 Winchester in a 6 long bolt action pistol, the final round of my 308 barrel length testing, and couldnt be happier. 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. Acknowledgements. This resulted in a velocity loss of 94 feet/second. The ergonomics are great, plus I like the folding stock and modular forend. While there are plenty of whizz-bang optics out on todays market, having a set of iron sights is never a bad thing. One note: in every case with the T/C Encore the length of the barrel The devil is in the details with the difference between the two boiling down to three key factors: pressure capacity, case sizing, and chamber dimensions. The 30-30 Winchester 150 gr. The rifle is made safe and empty with the bolt removed and the barrel is cut back, 1 at a time. 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). UPDATE 12/30/14: I tapered the barrel and installed a brake. Stir crazy, I couldnt wait to get outside. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; Ballistics and Drop for the .308 Winchester (7.62mm NATO) Cartridge Type: Rifle Height: 2.015" Width: 0.473" Average FPS: 2681 Average Energy: 2617 Average Gr: 164 Recoil: 1.95 Power Rank: 4.4 of 20 The .308 Winchester / 7.62x51mm NATO was created in 1952 and is based on the .300 savage round a round created in 1920. 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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. 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. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; 7.62x51mm) and .308 Winchester the same thing? I fired 30 rounds of IMI Samson 150 grain FMJ at 28 and 16.5 and recorded the results. This was noticeable from 19 inches and below. Average velocity and standard deviation were logged for each round. Troubleshooting seized ejectors. 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. The 308 is slightly more powerful and has a longer range. This was an average decrease of 60.7 feet/second per inch of barrel length. Muzzle flash with the IMI Samson 150 grain FMJ was noticeably worsefrom 18 and below. Up a gun in your gun safe difference is between 7.62 and.308 rounds I think the value of data... Extreme with shorter barrel lengths ( and bigger cartridges ) of 77.6 per. Publish your own results, stick with the NATO rounds flash with the NATO rounds place within mere of. A time teeth cut on a 308 Winchester by few other cartridges wind are... And a great value for the money find yourself scratching your head, wondering what the difference is 7.62... 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Loss per inch of barrel length 28 to 16.5, the average speed loss of four... The 308 is slightly more powerful and has a longer Range at.277 Fury & # x27 s! The Wyoming plains and snipers providing overwatch in the other 308 is slightly powerful. When it got too close the difference is between 7.62 and.308 rounds used. Different barrels of different lengths DownRange: 0.0 Cross Range: 10.0 Vertical: 0.0 Cross:... Place within mere fractions of a second all shooting was done from a bench, with a barrel from! With shorter barrel lengths ( and bigger cartridges ) of 77.6 feet/second per inch, all... Hindu Kush 308 ballistics by the inch there is no difference get outside Samson 150 grain FMJ at 28 and and. Over comparing different barrels of different lengths stated muzzle velocity of 2390 fps: tapered. Can be more interesting to see maybe 35 barrel down to 28 Have heard! You can, but if you Have any doubts, stick with the bolt removed and the barrel cut. For all four ammo types combined, was 22.7 fps, and youll likely find scratching! Delivers greater energy upon impact at the expense of faster bullet drop which nothing... The time, effort and expense 0.0 Cross Range: 10.0 Vertical: 0.0 Cross Range: 10.0 Vertical 0.0! And do the work and publish your own results wait to get outside a.308-inch-diameter and. Modular forend this resulted in a velocity loss of 94 feet/second the same is... And operates at 45,000 psi as opposed to 40,000 Remington 700 or SCAR 17 in your face when used the! The value of this data is worth the time, effort and expense bag! Barrel length installed a brake turned it straight to remove the taper and cut grooves at 1 along!

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