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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. After successful military trials, it was adopted as the standard chambering for Colt's M1911 pistol. [2]
Under imperial or US customary designations, there is typically no distinction between rimmed and unrimmed cartridges, unless one is referring to a rimmed version of a cartridge which is typically rimless, such as the .45 Auto Rim, a special rimmed version of the .45 ACP ("Automatic Colt Pistol" aka ".45 Auto"), intended for use in M1917 ...
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]
.45 ACP: The standard US pistol round for about 75 years. Typical .45 ACP loads are subsonic. [54].45 Colt: a more powerful 45-calibre revolver round using a longer cartridge. The .45 Colt was designed for the Colt Single Action Army and adopted by the US Army in 1873. Other 45-calibre single-action and double-action revolvers also use this round.
This is a list of firearm cartridges which have bullets in the 11 millimetres (0.43 in) to 11.99 millimetres (0.472 in) caliber range. Length refers to the cartridge case length OAL refers to the overall length of the cartridge
Also used are bullets similar to hollow-point bullets or soft-point bullets whose cores and/or jackets are deliberately weakened to cause deformation or fragmentation upon impact. The Warsaw Pact 5.45×39mm M74 assault rifle round exemplifies a trend that is becoming common in the era of high velocity, small caliber military rounds.
In the classic division a choice can be made between up to a 10-shot capacity 1911 with minor scoring (e.g. 9×19mm) or up to an eight-shot capacity 1911 with major scoring (e.g. .40 S&W or .45 ACP). In the revolver division major scoring can be achieved with a 9 mm bullet diameter, but with a power factor of 170.
Ballistics fall somewhere between the .40 S&W and the 10 mm Auto. [7] Unlike the 10 mm which operates at a SAAMI maximum of 37,500 psi, the .400 Corbon operates at 29,000 psi (although one source states that the pressure is 26,500 psi), [8] [9] much closer to the SAAMI maximum pressures for .45 ACP (21,000 psi), and .45 ACP +P (23,000 psi). [10]