P.O. Ackley

A picture of Parker Otto "P.O." Ackley, a famous gunsmith and author. He is probably most known for his development of a large number of wildcat cartridges.

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.

Cartridges Developed by P.O. Ackley

• .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 Ackley Improved Hornet, an improved .22 Hornet.
• .22 Eargesplitten Loudenboomer, developed to exceed 5,000 feet per second.
• .218 Ackley Improved Bee, an improved .218 Bee.
• .219 Zipper Improved, an improved .219 Zipper.
• .22/.30-30 Ackley Improved, a .30-30 Ackley Improved necked down to .22 caliber.
• .22-250 Ackley Improved, an improved .22-250 Remington.
• .223 Ackley Improved, an improved .223 Remington.
• .224 Belted Express, formed from .30-06 brass. A small number of die sets were made by RCBS.
• .228 Ackley Magnum, an improved 7×57mm Mauser necked down for .228 caliber bullets.
• 6mm AR Improved / 6mm AR Turbo, an improved 6mm AR (itself a necked-down 6.5mm Grendel).
• 6mm/.30-30 Ackley Improved, a .30-30 Ackley Improved necked down to 6mm (.243 caliber).
• .243 Ackley Improved, an improved .243 Winchester.
• .25 Ackley Krag, a .30-40 Krag necked down to .25 caliber.
• .25-06 Ackley Improved, an improved .25-06 Remington with a 40 degree angled shoulder.
• .25 Ackley Krag Short, a slightly shortened .25 Ackley Krag
• .250-3000 Ackley Improved, an improved .250-3000 Savage.
• .257 Ackley Improved, an improved .257 Roberts.
• .260 Ackley Improved, an improved .260 Remington.
• .270 Winchester Ackley Improved, an improved .270 Winchester.
• 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 cartridge with 40 degree shoulder, dies readily available. It duplicates the ballistics of the 7mm Remington Mag, with 30% less propellant used and less barrel erosion. Registered with SAAMI by Nosler.
• .30-30 Ackley Improved, an improved .30-30 Winchester