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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.
The 7×57mm Mauser Ackley Improved is an alternate version of the 7×57mm Mauser cartridge with 40 degree shoulder. This wildcat was designed to be easily made by rechambering existing firearms, and fire forming the ammunition to decrease body taper and increase shoulder angle, resulting in a higher case capacity.
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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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]