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Parker Otto Ackley (May 25, 1903 – August 23, 1989) [1] was an American gunsmith, barrel maker, author, columnist, and wildcat cartridge developer. The Ackley Improved family of wildcat cartridges are designed to be easily made by rechambering existing firearms, and fireforming the ammunition to decrease body taper and increase shoulder angle, resulting in a higher case capacity.
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 .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 ...
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.
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.
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ICL cartridges (ICL stands for Increased Case Load) are rare hunting wildcat cartridges developed by Arnold & Vern Juenke, [2] gunsmiths who owned Saturn Gun Works in Reno, Nevada. ICL cartridges are wildcats based on conventional cases in use at the time.
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