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The 6.5mm Grendel is an intermediate cartridge jointly designed by British-American armorer Bill Alexander, competitive shooter Arne Brennan (of Houston, Texas) and Lapua ballistician Janne Pohjoispää, as a low-recoil, high-precision rifle cartridge specifically for the AR-15 platform at medium/long range (200–800 yard).
The 6.5 Grendel bullets have a true diameter of 6.71mm / 0.264" and the 6.5 Grendel case can be formed from abundant 7.62x39 cases with a neck re-sizing die, and fire-forming a slight change to the shoulder, if the case is made from brass. Many of the popular 7.62x39 cases are made from steel, which will not work for reforming the shoulder.
The 7.62×39mm (also called 7.62 Soviet, formerly .30 Russian Short) [5] round is a rimless bottlenecked intermediate cartridge of Soviet origin. The cartridge is widely used due to the global proliferation of the AK-47 rifle and related Kalashnikov-pattern rifles, the SKS semi-automatic rifle, and the RPD/RPK light machine guns.
The 7.62×45mm has a 2.79 mL (43.1 gr H 2 O) cartridge case capacity. The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt-action and semi-automatic rifles and machine guns alike, under extreme conditions. 7.62×45mm maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm).
This article may lack conversion for SI units. Please add them to this article , preferably with {{ convert }} . Common rifle cartridges, from the largest .50 BMG to the smallest .22 Long Rifle with a $1 United States dollar bill in the background as a reference point.
From left to right: 1.17 Hornady Mach 2, 2.17 Hornady Magnum Rimfire, 3.22 Long Rifle, 4.22 Winchester Magnum Rimfire, 5.17/23 SMc, 6 5mm/35 SMc, 7.22 Hornet, 8.223 Remington, 9.223 WSSM, 10.243 Winchester, 11.243 Winchester Improved (Ackley), 12.25-06 Remington, 13.270 Winchester, 14.308 Winchester, 15.30-06 Springfield, 16.45-70 Government ...
Since there are many users in the U.S. that had adopted the 9×39 round prior to the import ban, were forced to reload their own ammunition. However, there are multiple companies worldwide who make 9.3mm (.366") Mauser bullets which are suitable for reloading in the 9×39, including Hornady, Barnes, Nosler, Prvi Partizan, Lapua, and others.
While it originally re-used 7.62x39 cases, once it became popular enough commercial ammunition started being manufactured, both in the USSR and in Finland. [4] [5] When it was introduced to the United States by SAKO it was stamped .220 Russian. Lapua later changed the designation to .220 Russian for the American market as well. [6] [5]