.25 ACP

.25 ACP
.25 ACP cartridge with scale
TypePistol
Place of originUnited States and Belgium
Production history
DesignerJohn Browning
Designed1905
Produced1905–present
Specifications
Case typeSemi-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 twist1:16
Primer typeSmall pistol
Maximum pressure25,000 psi (170 MPa)
Maximum CUP25,000 CUP
Ballistic performance
Bullet mass/type Velocity Energy
22 gr (1 g) +P HP 1,750 ft/s (530 m/s) 150 ft⋅lbf (200 J)
35 gr (2 g) JHP 900 ft/s (270 m/s) 63 ft⋅lbf (85 J)
45 gr (3 g) JHP 815 ft/s (248 m/s) 66 ft⋅lbf (89 J)
50 gr (3 g) FMJ 760 ft/s (230 m/s) 65 ft⋅lbf (88 J)
60 gr (4 g) Lead 850 ft/s (260 m/s) 96 ft⋅lbf (130 J)
Test barrel length: 2"
Source(s): Buffalo Bore
Ballistics 101

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.

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