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The .45 ACP (Automatic Colt Pistol), also known as .45 Auto, .45 Automatic, or 11.43×23mm [1] is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol.
It is essentially a .45 ACP case, necked down to .357, resulting in a cartridge similar in form to the earlier 7.65×21mm Parabellum and 7.63×25mm Mauser cartridges. It was created to be a low recoil target cartridge that would function reliably with multiple bullet types, FMJ to cast lead wadcutters without the feeding problems that straight walled pistol rounds sometimes exhibit. [2]
The .454 Casull generates almost five times the recoil of the .45 Colt, and about 75% more recoil energy than the .44 Magnum. [6] It can deliver a 250 grain (16 g) bullet with a muzzle velocity of over 1,900 feet per second (580 m/s), developing up to 2,000 ft-lb (2.7 kJ ) of energy from a handgun.
As the FBI was adopting a 10mm cartridge closer in bullet weight and velocity to the .45 ACP, there was a need for large amounts of newly built ammunition of this type. This requirement was later submitted to Federal Premium Ammunition for production and further review. This became known as the "10mm Lite", or "10mm FBI" load, or attenuated ...
The .38 Short Colt, also known as .38 SC, is a heeled bullet cartridge intended for metallic cartridge conversions of the cap and ball Colt 1851 Navy Revolver from the American Civil War era. [ 1 ] Later, this cartridge was fitted with a 0.358-inch (9.1 mm) diameter inside-lubricated bullet in the 125–135 grains (8.1–8.7 g) range.
The report indicated that the new powders and more advanced bullet designs used in current 9×19mm Parabellum defensive loads allowed for the caliber to deliver adequate performance compared to other calibers, like the .40 S&W and .45 ACP.
In the classic division a choice can be made between up to a 10-shot capacity 1911 with minor scoring (e.g. 9×19mm) or up to an eight-shot capacity 1911 with major scoring (e.g. .40 S&W or .45 ACP). In the revolver division major scoring can be achieved with a 9 mm bullet diameter, but with a power factor of 170.
However, the .500 Bushwhacker cartridge can generate 3,004.6 ft/s (916 m/s) with a 230-grain bullet from a 14-inch (356 mm) revolver. [6] The .460 cartridge achieves high velocities by combining light-for-caliber bullets, a large case capacity, and the high chamber pressures (65,000 psi maximum) typical of magnum rifle cartridges.
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