This is an inert .45 inch calibre ACP ( Automatic Colt Pistol ) cartridge, also known as the .45 Auto, designed by John Browning in 1904 for his Colt semi-automatic pistol. It was also suitable for the Colt M1911 pistol which was adopted by the US Army in 1911. Its metric size is 11.43mm with a 23mm case length. A very effective cartridge with a good reputation for performance.

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