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.25 ACP ammo background

The .25 ACP (automatic Colt pistol) was manufactured in 1905 by John Browning and is currently the smallest centerfire pistol round in production. It is chambered in pocket pistols and revolvers.

.25 ACP ammo specs

Manufactured for semi-automatic pistols, the semi-rimmed, straight-walled .25 ACP ammo was designed to match the performance of a .22 long rifle cartridge. The bullet's diameter is 251 inches (6.4 mm), extending to the neck (.276 inches, 7.0 mm) and to the base (.278 inches, 7.1 mm) and rim (302 inches, 7.7 mm). The case is .615 inches (15.6 mm) long, .91 inches (23 mm) overall. The rifling twist is 1:16. The primer is boxer small pistol variety.

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