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The .277 Wolverine has shown near-comparable performance to the 6.8 SPC with 110 gr (7.13 g) bullets, achieving similar muzzle velocities of 2,500 fps (762 m/s) vs. 2,700 fps (823 m/s). The smaller case of the .277 Wolverine (compared to the 6.8 SPC) is more efficient and has less recoil due to its smaller propellant load.
The neck is sized for .224 caliber bullets. 25-45 Sharps : Uses the standard military 5.56x45 case (also .223 cases), the neck is simply expanded to .257" 6.5mm Grendel :The Grendel uses the same head and rim from the .220 Russian and the 7.62x39 with a rim diameter of 0.441-0.449. The 6.5 Grendel bullets have a true diameter of 6.71mm / 0.264 ...
The cartridge name is derived from its caliber (.257 in (6.5 mm) bullet) and case length of 45 millimeters (necked-up 5.56×45 mm), as opposed to older hyphenated cartridges that were named for caliber and powder charge. Factory ballistics with the 87 gr (5.6 g) bullet equal those of the original .250-3000 Savage with the same bullet weight.
.303/25.25 Remington.25-45 Sharps.25-21 Stevens.25-25 Stevens.25 Winchester Super Short Magnum.250 Savage.25-06 Remington.25-20 Winchester.25-35 Winchester.25-45 Sharps.297/250 Rook.250-3000 Savage.255 Jeffery Rook.256 Gibbs Magnum.256 Newton.256 Winchester Magnum.257 Roberts.257 Weatherby Magnum.26 Nosler.260 Remington.264 LBC-AR
Same cartridge as .244 Remington and interchangeable. Rifles marked .244 Remington may not stabilize heaviest 6mm Remington bullets. [3] 6mm BR Norma: 1996 [14] Sweden 3 [15] [16] R 6x39.6mm 2789 [15] 0.243 0.517 [15] 39.6mm Norma's redesigned of the Remington 6mm BR in order to utilize VLD bullets. 6mm XC: 2000 US 4 [17] [18] R 6×48mm 3018 ...
Cartridges like the American 5.56×45mm M193 (1964; originally used in the M16), Soviet 5.45×39mm M74 (1974; used in the AK-74, which replaced the AKM), Belgian SS109 / 5.56×45mm NATO (1980; used in most AR-15 systems), and the Chinese 5.8×42mm (1987; used in the QBZ-95) allow a soldier to carry more ammunition for the same weight compared ...
The 7 mm version first appeared around 1980, with the .25 caliber appearing in 1987. The larger calibers provide more downrange energy, and resist wind deflection better than the original .22 caliber (5.56mm) bullet, and the moderate case capacity of the .223 Remington works well in the short pistol barrels.
The parent case (5.56×45mm NATO) was trimmed down to 1.560" and re-sized with a 7.62×40mm WT sizing die. [3] The overall case length after the shortening and re-sizing is 1.565". The cartridge was designed to use .308" diameter bullets in weights of 110 to 150 grains, with a standard twist rate of 1-12". [ 1 ]