what's the difference between 380 acp and 380 auto
.380 ACP
The . 380 ACP ( 9 × 17mm ) ( Automatic Colt Pistol ) is a rimless , straight - walled pistol cartridge developed by firearms designer John Moses Browning . The cartridge headspaces on the mouth of the case . It was introduced in 1908 by Colt , for use in its new Colt Model 1908 pocket hammerless semi-automatic , and has been a popular self - defense cartridge ever since , seeing wide use in numerous handguns ( typically smaller weapons ) . Other names for . 380 ACP include . 380 Auto , 9mm Browning , 9mm Corto , 9mm Kurz , 9mm Short , 9 × 17mm and 9 mm Browning Court ( which is the C.I.P. designation ) . It should not to be confused with . 38 ACP , from which it was developed . 
The . 380 ACP ( 9 × 17mm ) ( Automatic Colt Pistol ) is a rimless , straight - walled pistol cartridge developed by firearms designer John Moses Browning . The cartridge headspaces on the mouth of the case . It was introduced in 1908 by Colt , for use in its new Colt Model 1908 pocket hammerless semi-automatic , and has been a popular self - defense cartridge ever since , seeing wide use in numerous handguns ( typically smaller weapons ) . Other names for . 380 ACP include . 380 Auto , 9mm Browning , 9mm Corto , 9mm Kurz , 9mm Short , 9 × 17mm and 9 mm Browning Court ( which is the C.I.P. designation ) . It should not to be confused with . 38 ACP , from which it was developed .
The . 380 ACP (9 × 17mm) (Automatic Colt Pistol) is a rimless, straight-walled pistol cartridge. Another name for .380 ACP include .380 Auto.
The . 380 ACP ( 9 × 17mm ) ( Automatic Colt Pistol ) is a rimless , straight - walled pistol cartridge developed by firearms designer John Moses Browning . Other names for . 380 ACP include . 380 Auto , 9mm Browning , 9mm Corto , 9mm Kurz , 9mm Short , 9 × 17mm and 9 mm Browning Court ( which is the C.I.P. designation ) .
The .380 ACP (9 × 17mm) (Automatic Colt Pistol) is a rimless, straight-walled pistol cartridge.  Another name for .380 ACP includes .380 Auto.
The . 380 ACP ( 9 × 17mm ) ( Automatic Colt Pistol ) is a rimless , straight - walled pistol cartridge developed by firearms designer John Moses Browning . Other names for . 380 ACP include . 380 Auto , 9mm Browning , 9mm Corto , 9mm Kurz , 9mm Short , 9 × 17mm and 9 mm Browning Court ( which is the C.I.P. designation ) .