.380 Automatic is the SAMMI designation for a rimless, straight-walled pistol cartridge that was designed by John Moses Browning.

.380 Automatic headspace is measured from the rim of the case mouth.

cartridge type	pistol
case type	rimless, straight walled
bullet diameter	.355"
neck diameter	.373"
base diameter	.374"
rim diameter	.374"
rim thickness	.045"
case length	.680"
case trim length	.675"
overall length (maximum)	.980"
maximum pressure	21,500 psi

also known as:

• • 9mm Browning Short
  • 9mm Corto
  • 9mm Kurz
  • 9mm Short
  • 9x17mm
  • .380 ACP
  • .380 Automatic Colt Pistol

general attribution:

^{1 2}

1. “Voluntary Industry Performance Standards for Pressure and Velocity of Centerfire Pistol and Revolver Ammunition for the Use of Commercial Manufacturers. ⇒” Sporting Arms and Ammunition Manufacturers’ Institute. Ed. SAAMI’s Technical Committee. Web. 15-18 Jan. 2011.
2. “380 Automatic (9mm Kurtz).” Hornady Handbook of Cartridge Reloading. Ed. Neal Emery. 9th ed. Grand Island, Neb.: Hornady Manufacturing, 2012. 767-68. Print.