The .380 ACP (Automatic Colt Pistol) caliber, also referred to as 9mm shortor 9 x 17 was developed in 1908 by John Moses Browning. The .380 ACP is different from the apparently very similar caliber 9 mm para or 9 x 19in that it has a significantly lower muzzle energy. Unlike 9mm para, the .380 ACP is intended for use in unlocked mass-produced breechblocks, such as the Walther PPK intended.
Other designations are:
- 9 mm Browning (short)
- 9 × 17 mm (short)
- 9 mm short
- DWM540
- 9 mm Beretta M. 1934
- 9 mm Corto
- 9 mm Holland P. S. No. 21
- 9 mm M. 34
- 9 mm pistol cartridge No. 21
- 9 mm Pistol cartridge 400 (h)
- 9 mm self-loading pistol (.380)
- 9 mm short Browning
- .38 Colt Auto. - Hammerless
- .380 Auto. Hammerless Pistol
- .380 Automatic Pistol
- .380 Auto. Webley
- .380 C. A. P. H.
- .380 (9 mm) Auto.
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