.380 ACP
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The .380 ACP, is a rimless, straight-walled pistol cartridge developed by firearms designer John Moses Browning. The cartridge headspaces on the mouth of the case. Wikipedia
Bullet diameter: .355 in (9.0 mm)
Case capacity: 11.8 grains h20
Designed: 1908
Manufacturer: Colt's Manufacturing Company
Produced: 1908–present