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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 with the trade-off of a smaller ...
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]
.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.
An overview of 7mm caliber cartridges, their history, and uses in firearms.
Developed for use in pistols with barrels as short as 10 inches (25 cm), it develops the same power as a .30-30 with greater efficiency and less muzzle blast. [7] [self-published source].357 Herrett. Like the earlier .30 Herrett, this cartridge is based on the .30-30 Winchester, shortened and necked up to .357 (9 mm).
In C.I.P. regulated countries every rifle cartridge combination has to be proofed at 125% of this maximum C.I.P. pressure to certify for sale to consumers. This means that 7×64mm Mauser chambered arms in C.I.P. regulated countries were, as of 2014, proof tested at 519.00 MPa (75,275 psi) PE piezo pressure.
Some varmint hunters use the improved version of this cartridge, known as the .250 Ackley, .250 Improved or .250 Ackley Improved as a dual-purpose intermediate-range cartridge. The .250 Ackley is the same basic cartridge with a steeper shoulder and with the sides blown-out or straightened to increase powder space. [5]
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