.25 ACP
The .25 ACP (Automatic Colt Pistol), also known as the .25 Auto, .25 Automatic, or 6.35×16mmSR) is a semi-rimmed, straight-walled centerfire pistol cartridge introduced by John Browning in 1905 alongside the Fabrique Nationale M1905 pistol.
| .25 ACP | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
.25 ACP cartridge with scale | ||||||||||||||||
| Type | Pistol | |||||||||||||||
| Place of origin | United States and Belgium | |||||||||||||||
| Production history | ||||||||||||||||
| Designer | John Browning | |||||||||||||||
| Designed | 1905 | |||||||||||||||
| Produced | 1905–present | |||||||||||||||
| Specifications | ||||||||||||||||
| Case type | Semi-rimmed, straight | |||||||||||||||
| Bullet diameter | .2512 in (6.38 mm) | |||||||||||||||
| Land diameter | .2429 in (6.17 mm) | |||||||||||||||
| Neck diameter | .276 in (7.0 mm) | |||||||||||||||
| Base diameter | .278 in (7.1 mm) | |||||||||||||||
| Rim diameter | .302 in (7.7 mm) | |||||||||||||||
| Rim thickness | .043 in (1.1 mm) | |||||||||||||||
| Case length | .615 in (15.6 mm) | |||||||||||||||
| Overall length | .910 in (23.1 mm) | |||||||||||||||
| Rifling twist | 1:16 | |||||||||||||||
| Primer type | Small pistol | |||||||||||||||
| Maximum pressure | 25,000 psi (170 MPa) | |||||||||||||||
| Maximum CUP | 25,000 CUP | |||||||||||||||
| Ballistic performance | ||||||||||||||||
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| Test barrel length: 2" Source(s): Guns & Ammo Magazine | ||||||||||||||||
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