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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]
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.
One example of such a cartridge is the .357 Magnum, which was developed from the .38 Special in 1934 by firearms manufacturer Smith & Wesson. .38-40. One of the oldest wildcats, the .38-40, introduced by Winchester Repeating Arms Company in 1874, was made by necking down a .44-40.
Based on the .25-35 Winchester and similar to the .25/35 Ackley Improved. Can also be made by necking-down.30-30. P.O. Ackley calls it "efficient and surprising". Performance with a 87-grain (5.6 g) bullet is approximately 3,100 ft/s (940 m/s) and with a 100-grain (6.5 g) bullet is approximately 2,650 ft/s (810 m/s). [12]
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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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