.45 Colt
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The .45 Colt (11.43×33mmR), 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.
Diagram of .45 Colt U.S. Army "ball cartridge" for Army M1909 revolver, with dimensions in inches.
.45 Colt shown alongside other cartridges. From left to right: .30-06, 7.62×39mm, .454 Casull, .45 Colt, .357 Magnum, .38 Special, .45 ACP, 9×19mm Parabellum, .380 ACP, .22 Long Rifle
.45 Colt cartridge featuring a jacketed hollow point bullet
.45 Schofield
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The .45 Schofield, also referred to as .45 Smith & Wesson is a revolver cartridge developed by Smith & Wesson for their S&W Model 3 Schofield top-break revolver. It is similar to the .45 Colt cartridge, but with a shorter case and a larger rim. The. 45 Schofield will generally work in revolvers chambered for that cartridge; but the reverse is not true, since the .45 Colt case is longer. United States government arsenals supplied .45 Schofield cartridges for the Schofield revolver and the Colt Army revolver to help simplify their armament needs.
Early .45 Colt cartridges, in the center is the shorter cartridge for the S&W Schofield revolver with Benet primer