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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 .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 ...
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]
Chambered only in single-shot rifles due to its short, fat case and sharp shoulder angle, the 6mm PPC is still going strong in benchrest after 30 years..22 Eargesplitten Loudenboomer. This humorously named cartridge was developed by P. O. Ackley specifically to exceed 5,000 ft/s (1,500
Olympic was the first in the industry to offer AR-15-style firearms in 9×19mm and .45 ACP, 10mm Auto, 7.62×39mm, and the Winchester Super Short Magnum cartridges. [ 1 ] In late 1987, the company purchased Phoenix, Arizona-based M-S Safari Arms, adding the M1911 pistol to its lineup under the name Safari Arms.
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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The .17 Ackley Bee is a wildcat centerfire rifle cartridge named after its designer, P.O. Ackley, and is a .218 Bee case necked down to .17 caliber with a sharper shoulder and less body taper. Being a rimmed case, it was popular in single shot rifles such as the Martini Cadet and Low Wall Winchester . [ 2 ]