|Place of origin||United States and Belgium|
|Case type||Semi-rimmed, straight|
|Bullet diameter||.251 in (6.4 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||.91 in (23 mm)|
|Primer type||Small pistol|
|Maximum pressure||25,000 psi (170 MPa)|
|Test barrel length: 2"|
Source(s): Guns & Ammo Magazine
Though the .25 ACP was designed for semi-automatic pistols, various .25 ACP revolvers were produced in the early twentieth century by Belgian, French, and German gunmakers such as Adolph Frank and Decker. In the late twentieth century, Bowen Classic Arms produced a custom Smith & Wesson revolver in .25 ACP.
The use of the .25 ACP allows for a very compact lightweight gun, but the cartridge is relatively short-ranged and low-powered, putting it in the same class as the .22 LR rimfire cartridge but at a significantly higher cost. The .25 ACP is viewed by some as a better choice for personal defense handguns due to its centerfire-case design, which is inherently more reliable and more powerful than a .22 LR rimfire cartridge.
The Walther Model 9 pistol uses 6.35mm
Raven MP-25 .25 ACP chrome with faux mother of pearl grips and push up safety
- *Wilson, R. K. Textbook of Automatic Pistols. Plantersville, SC: Small Arms Technical Publishing Company, 1943. p. 258. ISBN 978-0-935632-89-7.
- Hogg, Ian; Walter, John (2004-08-29). Pistols of the World. David & Charles. ISBN 0873494601.
- Bowen, Hamilton. The Custom Revolver. Privately printed, 2001. ISBN 978-0-9713366-0-5.
- Jerry Ahern (2010), Gun Digest Buyer's Guide to Concealed-Carry Handguns, Gun Digest Books, pp. 19–20, ISBN 978-1-4402-1383-0
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