Parker Otto Ackley (May 25, 1903 – August 23, 1989)[1] was an Americangunsmith, barrel maker, author, columnist, andwildcat cartridge developer. TheAckley 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. Ackley improved not only standard cartridges, but also other popular wildcats, and was the first to create a .17 caliber (4.5 mm) centerfire cartridge.[2]
Ackley began gunsmithing full-time in Oregon in 1936, but was interrupted byWorld War II. In 1945, he established a new shop inTrinidad, Colorado, and soon became one of the largest custom gunmakers in the United States. He was also on the staff of the magazinesGuns&Ammo andShooting Times, and was an instructor at theTrinidad State Junior College from 1946 to 1951, where he did much experimentation in the field of firearms.[3]
The following is a list of Ackley cartridges, both "Improved" versions (requiring only fireforming) and more complex versions involving case length reductions or caliber changes. In addition to being easy to form, firearms chambered for the "Improved" cartridges could fire standard factory loaded ammunition as well, allowing a shooter to use commonly available ammunition if the wildcat loads were not available.[4][self-published source][5]
.17 Ackley Hornet, a .22 Ackley Hornet necked down to .17 caliber (4.5 mm)
.17 Ackley Bee, a .218 Improved Bee necked down to .17 caliber (4.5 mm)
.224 Belted Express, formed from.30-06 brass; very few die sets were made byRCBS
.228 Ackley Magnum, an improved7×57mm Mauser necked down to .228 caliber (5.8 mm); bullets in this size are hard to find but provide greater weight than .223 caliber bullets, up to 100 grains (6.5g), without excessively quick twist rate.
7×57mm Mauser Ackley Improved, an improved version of the7×57mm Mauser cartridge with 40 degree shoulder, dies readily available.
.280 Ackley Improved, an improved version of the.280 Remington cartridge with 40 degree shoulder, dies readily available. It duplicates the ballistics of the vaunted 7mm Remington Mag, with 30% less propellant used and less barrel erosion. Registered with SAAMI byNosler.
.30 Ackley Magnum No. 1 and No. 2 short, based on theHolland & Holland belted magnum, the No. 2 version designed to fit in standard length actions (.30-06 class)
.303 Ackley Improved, an improved version of the.303 British Mark VII service cartridge
.338-06 Ackley Improved, an improved.338-06 A-Square (which is a .30-06 necked up to .338 caliber)
.348 Ackley improved, an improved.348 Winchester which gets about 200 feet a second more velocity over the standard.
.35 Ackley Magnum No. 1 and No. 2 short, based on the .30 Ackley Magnum cases; there is also an Improved version of the No. 2.
Ackley was not just a wildcatter but a researcher as well, often testing firearms to destruction in the search for information. He also produced a number of experimental cartridges, not intended to be practical, but rather to test the limits of firearms. One of these experimental cartridges was the .22 Eargesplitten Loudenboomer. This humorously named cartridge was developed by Ackley for Bob Hutton ofGuns & Ammo magazine, and was intended solely to exceed 5,000 ft/s (1,500 m/s) muzzle velocity. Ackley's loads only managed 4,600 ft/s (1,400 m/s)(Mach 4.2), firing a 50-grain (3.2 g) bullet. Based on a.378 Weatherby Magnum case, the case is impractically over-capacity for the bore diameter, and so the cartridge remains a curiosity. The advent of new slower-burning smokeless powders may have changed the equation.[8]
A .243 Winchester (right) beside the Ackley Improved version; only the shoulder angle is changed to the sharper shoulder angle typical of the Ackley Improved cartridges. In this instance the shoulder diameter of the Improved normally remains the same as the original case at .456"-.457" with no significant change in body taper. However, minor variations exist with some drawings showing a slightly larger .460" shoulder diameter.
