.45 Colt

Revolver cartridge designed by the U.S. Army

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. This cartridge was adopted by the U.S. Army in 1873 and served as an official US military handgun cartridge for 19 years, before being replaced by the .38 Long Colt in 1892. Although there has never been a ".45 Short Colt" cartridge, the .45 Colt is frequently called the ".45 Long Colt" to better distinguish it from the shorter .45 Schofield cartridge, which was also in use around the time the .45 Colt was introduced.

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