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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 loaded cartridges made at the Evansville-Chrysler plant across town and then packed them in shipping crates for shipment. In November, 1943 it was the first plant to package ammo in vacuum-packed metal cans. In the Spring and Summer of 1944 it was employed in inspecting and repacking .45 ACP and .30 Carbine ammunition.
.45 ACP Italy: Revol Arms DL45 Revol Arms .45 ACP United States: 2017 RIA 1911: Armscor (Philippines).45 ACP 10mm Auto.40 S&W.38 Super 9mm Luger.22 TCM Philippines: Ruger P90: Sturm, Ruger & Co..45 ACP United States: 1985 Ruger P97: Sturm, Ruger & Co..45 ACP United States: 1999 Ruger SR45: Sturm, Ruger & Co..45 ACP United States: 2007 Ruger Redhawk
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]
While the .45 ACP uses .451 inches in diameter for jacketed bullets, and .452 for lead bullets, the .45 Colt still uses .452 inch diameter jacketed bullets and .454 diameter lead bullets, often adding to the confusion between the two cartridges with similar names as the .45 ACP and Model 1911 pistols will often be called ".45 Colt" in common ...
The .45 Auto Rim, also known as 11.5x23mmR, is a rimmed cartridge specifically designed to be fired in revolvers originally chambered for the .45 ACP cartridge.. The Peters Cartridge Company developed the cartridge in 1920 for use in the M1917 revolver, large numbers of which had become available as surplus following the end of World War I. [3]
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B shows a concave sided SWC, typical of a lightweight .45 ACP bullet used in bullseye shooting. The concave sides reduce the bullet weight, and thus the recoil, while keeping the overall length of the bullet long enough to feed reliably in a semi-automatic pistol such as the M1911 commonly found in bullseye competitions. [2] [3]