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Since cases for the .280 RCBS could be formed by firing .280 Remington ammo in a rifle chambered for the former, Ackley abandoned the 7mm-06 Improved and started chambering rifles for the .280 RCBS. He then changed the 35-degree shoulder to 40-degrees and the .280 Ackley wildcat was born.
.260 Remington.264 LBC-AR.264 Winchester Magnum.270 Weatherby Magnum.270 Winchester.270 Winchester Short Magnum.275 H&H Magnum.275 No 2 Magnum.275 Rigby.276 Enfield.276 Pedersen.277 FURY.277 Wolverine.28 Nosler.280 Ackley Improved.280 British.280 Flanged.280 Jeffery.280 Remington.280 Ross.284 Winchester
8mm Lebel replacement. Rimless rifle cartridge. Same bullet diameter as .30-06. Short-lived due to confusion with 7.92mm Mauser. 7.5×54mm French: 1929 France R 7.57x54mm 2700 2232 58 0.308 54mm Case-shortened 7.5×57mm MAS. Standard French rifle cartridge until the introduction of the FAMAS in 1979. 7.62×25mm Tokarev: 1930 [3] USSR [8] 2 [13 ...
The .280 Ackley Improved (.280 AI) was the result of the .280 Remington case modification by P.O Ackley, who pushed out the sidewalls at the shoulder to near parallel and steepened the shoulder angle to 40 degrees in order to increase powder capacity, thus along with increasing the allowable pressure, resulted in increasing the bullet initial velocity by approximately 100 fps.
The American .280 Remington cartridge is probably the closest ballistic twin of the 7×64mm. When compared to the 7×64mm, the .280 Remington has a slightly lower maximum allowed chamber pressure and as an American 7 mm cartridge has a slightly smaller groove diameter. European 7 mm cartridges all have 7.24 mm (0.285 in) grooves Ø diameter. [6]
7mm Remington cartridges; 7mm-08 Remington.17 Remington.17 Remington Fireball.22 BR Remington.22 Remington Automatic.22 Remington Jet.25 Remington.25-06 Remington.30 Remington.30 Remington AR.32 Remington.35 Whelen.41 Remington Magnum.44 Magnum.44 Remington Centerfire.45 Remington–Thompson.50 Remington Navy.257 Roberts.280 Remington.357 ...
His last rifle was a Ruger M77 customized by Al Biesen, chambered in the .280 Remington cartridge to the following specifications: [7] “Stock French walnut in a nice grained contrasty piece not so elaborate with Deluxe Fleur-de-lis checkering, ebony forend tip, skeleton grip cap and skeleton butt plate.
The 7mm WSM cartridge achieves its useful purpose as an excellent cartridge for larger mule deer, sheep, black bear and elk. Winchester claims a muzzle velocity (MV) of 3,225 ft/s with a 140 grain bullet for their 7mm WSM cartridge; the claimed muzzle energy (ME) is 3,233 ft. lbs.