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The .45 Colt (11.43×33mmR), often called the .45 Long Colt, is a rimmed straight-walled handgun cartridge dating to 1872.It was originally a black-powder revolver round developed for the Colt Single Action Army revolver.
The .45 ACP (not to be confused with .45 Colt) cartridge is a very popular caliber due to its low velocity and relatively high stopping power. This caliber is associated most with the Colt M1911, logically, as ACP literally means 'Automatic Colt Pistol'. However, there are many more guns and variations on the M1911 that are chambered in .45 ACP.
For comparison, Hornady's 9249 load for the .500 S&W Magnum cartridge offers slightly less energy at the muzzle, achieving 2,868 ft⋅lbf (3,888 J) by driving a 300 grain (19 g) FTX bullet at 2,075 ft/s (632 m/s). Buffalo Bore's loading for the .500 S&W cartridge offers much less energy at the muzzle, achieving only 2,579 ft⋅lbf (3,497 J) by ...
The .45 Schofield cartridge was shorter than the .45 Colt. It could be used in both the Schofield and the Colt 45 Peacemaker, but the .45 Colt was too long to use in the Schofield. As a result, by the late 1880s the army finally standardized on a .45 cartridge designed to fire in both revolvers, the M1887 Military Ball Cartridge.
Although not originally designed for handguns, several rifle and shotgun cartridges have also been chambered in a number of large handguns, primarily in revolvers like the Phelps Heritage revolver, Century Arms revolver, Thompson/Centre Contender break-open pistol, Magnum Research BFR, and the Pfeifer Zeliska revolvers.
The .460 S&W Magnum was derived from the .454 Casull while the .454 Casull was derived from the .45 Colt. Because of this lineage the .460 S&W Magnum has similar dimensional attributes to the .45 Colt with the exception of a much longer casing. As such, revolvers chambered to .460 S&W Magnum will usually chamber the shorter .45 Colt.
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When it became obvious in the field that the two cartridges would not work interchangeably in the Schofield (although they both worked in the Colt), the U.S. government adopted the shorter .45 Schofield cartridge as the standard cartridge. Despite the change, old stocks of the longer .45 Colt rounds in the supply line caused the Army to drop ...