The Colt Model of 1873 Single Action Army-0īy 1876 the Colt SAA was being offered in additional calibers for civilian and foreign military sales. Which was replaced by the Colt M1892, then the US Army temporary used the Peacemaker for a short time. The Colt quickly gained favor over the S&W and remained the primary US military sidearm until 1892. 45 Schofield, which would also fit in the Colt SAA. That gun took a shorter, slightly less potent version of the. The US Army approved a second standard military handgun of the same period, a Smith and Wesson "breaktop" single action with modifications by a US Army Major by the name of Schofield. 45 LC was the initial cartridge the SAA was chambered for in 1873. However, because that load pushed the chamber pressure limit of the original 1873 revolvers the government cut the powder charge down to 36 grains (2.3 g) of FFg black powder, which gave the bullet the 800 to 900 ft/s (240 to 270 m/s) muzzle velocity. Using the original load intended for the Single Action Army, a 250 grain (16 g) cast lead bullet over 40 grains (2.6 g) of FFg black powder, muzzle velocities of around 1000 ft/s (300 m/s) can be achieved. 45 ACP pistols, due to its long barrel length. Despite the lower pressure, the muzzle velocity of the Single Action Army is about the same as-or slightly higher than-many. 45 Colt must be kept under 14,000 lbf/in² (97 MPa) to be safe in older guns. 45 ACP ammunition is regulated to under 21,000 lbf/in² (145 MPa), while. 45 Automatic Colt Pistol (.45 ACP) cartridge commonly used in semi-automatic pistols.
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45 Colt cartridges (often known as '.45 Long Colt' or '.45 LC'), which should not be confused with the.