Parker Otto Ackley (May 25, 1903, Granville, New York – August 23, 1989) was an American gunsmith, author, columnist, and perhaps most famously, a firearms researcher and wildcat cartridge creator.
Ackley started his career as a gunsmith in Oregon in 1936, But World War II would soon interrupt. In 1945, he opened a new shop in Trinidad, Colorado, and soon became one of the largest custom gunmakers in the United States. He was also on the staff of the magazines Guns & Ammo and Shooting Times. Ackley was an instructor at the Trinidad State Junior College from 1946 to 1951, where he had the opportunity to do a great deal of research and development.
Cartridges Developed by P.O. Ackley
A (probably incomplete) list of cartridges developed and/or improved by Parker Otto Ackley. Keep in mind, the "Improved" cartridges could all be formed from standard cases, and firearms chambered for them could also fire their standard non-improved counterparts as well! However, other cartridges without the "improved" nomenclature, do not share these characteristics as they would require length and/or caliber changes.
- .17 Ackley Hornet, a .22 Ackley Hornet necked down to .17 caliber.
- .17 Ackley Bee: a .218 Improved Bee necked down to .17 caliber.
- .22 Eargesplitten Loudenboomer, developed to exceed 5,000 feet per second.
- .25 Ackley Krag Short, a slightly shortened .25 Ackley Krag.
- .250-3000 Ackley Improved, an improved .250-3000 Savage.
- 7×57mm Mauser Ackley Improved, an improved version of the 7×57mm Mauser cartridge with 40 degree shoulder, dies readily available.
- .280 Remington Ackley Improved, an improved version of the .280 Remington with 40 degree shoulder. Replicates ballistics of the 7mm Remington Magnum, with 30% less propellant used and less barrel erosion. Registered with SAAMI by Nosler.