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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.
List of rifle cartridges, by primer type, calibre and name. From left to right: ... .280 Remington.280 Ross.284 Winchester.30 caliber – .39 caliber
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.
Since its dimensions are taken from the 30-06 cartridge from the 1906 US Army cartridge, the lower half of these case dimensions have been used for designing the .243 Winchester, 25-06, .270 Winchester, .280 Remington, 7mm-08, .308, .30-06, .35 Whelen, and others.
.280 Ackley Improved, an improved version of the .280 Remington cartridge with 40 degree shoulder, dies readily available. It duplicates the ballistics of the vaunted 7mm Remington Mag, with 30% less propellant used and less barrel erosion. Registered with SAAMI by Nosler..30-30 Ackley Improved, an improved .30-30 Winchester
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 ...
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The commercial .280 Remington (or 7mm Express Remington) is very similar, but uses the slightly longer 65 mm 30-03 case with the shoulder headspace extended slightly more than one millimeter (.05 inch) to prevent chambering in .270 Winchester rifles. [17]