308 ballistics by the inch
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. ATTENTION: Effective Sept 1, 2020, the BBTI Project is in "Archive Status." He,he. All shooting was done from a bench, with a Sinclair rest and rear bag. The barrel was cut off using a cold saw. Need help keeping it straight? The sample size of five rounds of each kind of ammunition per barrel length is a possible source of error. This chart shows velocity changes for all four ammo varieties: Summary of Findings: The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. With tunning accuracy is 99.7%. Yes, it did. Blueprinting (Truing) a Remington 700 Action, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter H4895 is the first powder Hodgdon introduced. lb Muzzle Velocity ft/sec. Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) 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 That said, we wouldnt make a habit of it. Why you ask? Maybe ask the doctorate students at MIT. 300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16 300 Win Mag? Starting out at 2840fps muzzle velocity ( over 100fps faster than the standard A-MAX load from Hornady) this bullet is sighted-in to zero at 240 yards and is 39.16 low at 500 yards. this insane project much more practical. First, lets talk about pressure. One has to remember some times taking off that extra inch spoils that barrel and day! Nearly every target shooter had his teeth cut on a 308 Winchester. I had 100% extraction during the course of this experiment. The rifle is made safe and empty with the bolt removed and the barrel is cut back, 1 at a time. 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. photo link: http://rifleshooter.com/wp-content/uploads/2015/01/custom-16.5-rem-700-308.jpg. After 15 years Im still working it out. 7.62x51mm) and .308 Winchester the same thing? Thank you. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; 308 Winchester: BBA JHP: 175: 2832: 2700: 308 Winchester As always, Big Army inefficiency slowed down testing and evaluation and, in the meantime, Winchester got hold of the new cartridge dimensions. Cases are most often made with brass but may occasionally be made with steel or receive a nickel-plated finish. Trajectory for Custom .308 165 TGK #4667 AMMO at 2680 Feet per Second. 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. 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. Doing the opposite is a bit more complicated. *Casing image above is an artist rendering and not a real photo of .308 Winchester (7.62mm NATO) Ballistics cartridge. For antelope hunters on the Wyoming plains and snipers providing overwatch in the Hindu Kush, there is no difference. With the .30 caliber bullet diameter being translated as 7.62 millimeters, the new 7.62x51mm cartridge was born. 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. _gaq.push(['_setAccount', 'UA-6323545-2']); var _gaq = _gaq || []; It helped pave the way for the successful powder company that exists today. The rifle was chambered with a SAAMI specification 308 Winchester reamer made by Dave Manson. Much Different Results with 6mmBR and a Longer Barrel Never miss a post! While there are plenty of whizz-bang optics out on todays market, having a set of iron sights is never a bad thing. 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. 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? You can find AVG change ft/sec per inch represents the average loss of velocity per inch based on the running averages. That works out to an average loss of 22.7 fps per inch. CLICK HERE to Read the Rifleshooter.com Test. The 7.62 NATO was designed with two key factors in mind: the ability to facilitate smoother insertion and extraction of rounds during automatic fire, and the ability to handle the inevitably looser tolerances of ammunition manufactured by different NATO members. the firearms community. 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. American Eagle (Federal) Full Metal Jacket Boat-Tail, 150gr. Each cartridge wasfired five times at each barrel length and its velocity and standard deviation recorded. Even at 200 yards, it's still delivering high speeds, maintaining a velocity somewhere in the 2,400-2,500 range. .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. When you pull the trigger on your M14, it starts a chain reaction. Mag. ga.src = ('https:' == document.location.protocol ? Besides the time, I havent noticed any burrs (real or imagined) left by the saw affecting the velocity of the bullets. Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. Initially we intended to test both 9mm and .45ACP cartridges for this sequence. Or not. The .308 Winchester round shoots pretty flat out to 200 yards when it starts to drop. 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. The initial testing was done in 2008 and tested the velocity of 13 common handgun cartridges as it related to firearm barrel length. var _gaq = _gaq || []; I use a Forster Match Rife Headspace Gauge Kit. 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. Does anyone have data on bullet drop vs barrel length? Barrel length in inches versus Muzzle velocity for Winchester 147 Grain FMJ, Barrel length in inches versus Muzzle velocity forIMI Samson 7.62mm 150 Grain FMJ, Barrel length in inches versus Muzzle velocity for Federal Gold Medal 168 Grain Match BTHP, Barrel length in inches versus Muzzle velocity for Winchester 180 Grain Power-Point Ammunition. 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. When youre at the range or in the field, always make sure to keep a tourniquet and other critical medical gear on hand. Ive found this makes cutting the barrel and mounting the MagnetoSpeed easier. This was an average decrease of 60.7 feet/second per inch of barrel length. Your data showed the 7.6239 mm Russian slowed down from 23 to 24 in barrel length. The cuts were made in one-inch intervals with a rotary saw. mostly) paid for everything ourselves, and we did not receive any kind of sponsorship Interestingly, these numbers jive pretty well with estimates found in reloading manuals. Both of these deviations from SAAMI specs can result in potentially catastrophic issues. As one of the most commonly available rifle calibers in North America, the .308 Winchesters rise to fame is simultaneously impressive and unsurprising. This could have some potentially expensive consequences. 308 Winchester/ 7.62x51mm NATO Comparison of velocity data. 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. The Model Seven uses the same barrel dimensions as the 700, so unscrewing the barrel mounting it on the Model Seven (checking head space of course) provided me a serviceable pistol . 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. Ballistics by the Inch (often called BBTI) was a project to test the performance characteristics of a variety of common handgun calibers/cartridges. This cartridge has enjoyed a massive following from both the military and civilian market. was measured from the end of the barrel back to the breech face. Create Your Free Custom Ballistic Report Liked this? Ive found this makes cutting the barrel and day using a cold saw massive following from the! And the barrel back to the breech face to the breech face and 0.010 beyond... 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