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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.
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 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
The 6×45mm is a rimless, bottlenecked cartridge based on the .223 Remington or 5.56 NATO cartridge necked up to .243 (6mm). The cartridge is also known as the 6mm-223 Remington or 6mm/223 . History
firearms cartridge with a larger case size than, or derived from, a similar cartridge of the same bullet caliber and case shoulder shape Q117316056: Mark 149: Q11884059: Naturalis: Q3507446: Nitro Express: cartridge family Q11819803: Pluton-1: Polish fragmentation shell for 60 mm caliber mortars Q11833326: Rad-2: Polish mortar cartridge Poland ...
Bullet Length Rim Base Shoulder Neck OAL .25-06 Remington [1] 6.541 (.2575) 63.35 (2.494) ... .25-45 Sharps: 6.53 (.257) 44.7 (1.76) 9.6 (.378) 9.6 (.376) 8.99 (.3539)
However, the ammo was much heavier (393 gr (25.4 g) for 7.62 x 51 round compared to 160 gr (10.4 g) for .45 ACP), effectively limiting the ammo load. Additionally, when fired in full automatic mode free recoil delivered by full-sized and full-powered cartridges became an issue, too.