.45 ACP

The .45 ACP (11.43x23mm) is a firearms cartridge used in pistols and submachine guns. Designed by John Moses Browning, this ammunition became widely known through the globally use of the Colt M1911 pistol and the Thompson and the M3 submachine guns. Used in WWI, WWII, Korean War, Vietnam, and many other armed conflicts, the .45 ACP is one of the most massively manufactured cartridge in modern military history. The acronym “ACP” stands for “Automatic Colt Pistol, since it was developed to be fired from this handgun at the beginning of the 20th century. The reason for developing this round was that the .38 Long Colt ammunition, formerly used by the US Army, was not powerful enough to stop a charging soldier, as it had been demonstrated in the Philippine-American War (1899-1902).


Composed of a projectile, a rimless brass casing, and a primer, the .45 ACP is available with either full metal jacket or hollow-point projectiles, which measures 11.43 mm in diameter. The case is 23 mm long, with a diameter of 12.1 mm. Although it has a strong stopping power, effectively use in the Great War against a charging infantryman, this ammunition is ineffective against body armor due to its low-velocity.

Full metal jacket version


Hollow-point rounds


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Thor is Carlos Benito Camacho, the manager and writer of this blog.