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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.
Common rifle cartridges, from the largest .50 BMG to the smallest .22 Long Rifle with a $1 United States dollar bill in the background as a reference point.. This is a table of selected pistol/submachine gun and rifle/machine gun cartridges by common name.
.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.
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).
The .221 Fireball was a necked back .222 Remington, designed for greater efficiency in the 10 in (25 cm) barrel of the XP-100. Even loaded with a smaller load of faster powder for the short barrel, the .221 Fireball lived up to its name, with a massive muzzle flash; the performance, however, was unheard of for its day: over 2700 feet per second ...
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The .257 Roberts, also known as .257 Bob, [2] is a medium-powered .25 caliber rifle cartridge.It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the 5 mm (.22 in) and 6 mm (.24 in), and has more energy, but is harder recoiling, similar to larger hunting calibers, such as the 7 mm (.28 in) and 7.62 mm (.30 in).
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