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.30 Ackley Magnum No. 1 and No. 2 short, based on the Holland & Holland belted magnum, the No. 2 version designed to fit in standard length actions (.30-06 class).303 Ackley Improved, an improved version of the .303 British Mark VII service cartridge.338-06 Ackley Improved, an improved .338-06 A-Square (which is a .30-06 necked up to .338 caliber)
P.O. Ackley was a notable gunsmith famous for developing wildcat cartridges from parent cartridges like the 30-06 Springfield. For many of the wildcats listed above, and several of standardized commercial chamberings based on the 30-06 cartridge, there are "Ackley Improved" versions with sharper shoulders increasing case capacity. [25]
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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.
A Remington Model 870 shotgun. Below is a list of firearms produced by the Remington Arms Company, [1] founded in 1816 as E. Remington and Sons. Following the breakup of Remington Outdoor Company in 2020, the Remington Firearms brand name operates under RemArms, LLC.
The .219 Zipper is the parent case of the .219 Donaldson Wasp, and P.O. Ackley created the .219 Zipper Improved in 1937. Leslie Lindahl's Chucker and Super-chucker and "wildcat" case modifications by Hervey Lovell, Lysle Kilbourne, and W. F. Vickery offered similarly superior ballistics in stronger single-shot and bolt actions.
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The .17 Hornet / 4.4x34mmR is a .17 caliber centerfire rifle cartridge originally offered as a "wildcat cartridge" developed by P.O. Ackley in the early 1950s. He created this non-factory (wildcat) offering by simply necking-down the .22 Hornet to .17 caliber and fire forming the resized cases in his new chamber design. The result was a small ...