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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 ...
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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]
≡ 1 × 10 −18 m: ≡ 1 × 10 −18 m: barleycorn (H) = 1 ⁄ 3 in (see note above about rounding) = 8.4 6 × 10 −3 m bohr, atomic unit of length: a 0 = Bohr radius of hydrogen ≈ 5.291 772 1092 (17) × 10 −11 m [2] cable length (imperial) ≡ 608 ft: ≈ 185.3184 m cable length (International) ≡ 1 ⁄ 10 nmi: ≡ 185.2 m cable length ...
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.
IC architect J.H. Schott designed the new depot at Ackley, and it was built by Coomer & Small Construction Company of Sioux City. The long and low single-story brick building exhibits influences from the Prairie School and the Tudor Revival style. A combination depot is one that incorporates passenger and freight services in the same building.
P.O. Ackley favored short .30 caliber magnums and called it "highly recommended." Performance with a 150-grain (9.7 g) bullet is up to 3,590 ft/s (1,090 m/s), with a 180-grain (12 g) bullet is up to 3,200 ft/s (980 m/s) and with a 220-grain (14 g) bullet is up to 2,705 ft/s (824 m/s).
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