.45 ACP
.45 ACP
Vital statistics
Introduction Date 1911
Service Length 1911-Present
Case Type Rimless, straight
Bullet Diameter .452 in (11.5 mm)
Neck Diameter .473 in (12.0 mm)
Base Diameter .476 in (12.1 mm)
Rim Diameter .480 in (12.2 mm)
Case Length .898 in (22.8 mm)
Overall Length 1.275 in (32.4 mm)
Rifling Twist 1 in 16 in (406 mm)
Primer Type Large or Small Pistol
Maximum Pressure 21,000 psi (140 MPa)
Bullet Weight/Type
  • 185 gr (12 g) Bonded Defense
  • 185 gr (12 g) Speer Gold Dot JHP
  • 200 gr (13 g) Speer Gold Dot JHP +P
  • 230 gr (15 g) Federal Hydra-Shok
  • 230 gr (15 g) US Army Ball FMJ
  • The .45 ACP (11.43x23mm) is an ammunition type for weapons that are mostly pistols and submachine guns. It has remained one of the best rounds in the world.


    The .45 ACP wasn't produced until 1911; before the start of World War 1. It was utilized by the American icon; the Colt M1911 and it's variants. It later became the round for other weapons; from other countries.

    Present Day UsageEdit

    The .45 ACP; from it's introduction in the 20th century; has remained one of the most popular pistol calibers to be utilized and even after a service of over 100 years; the round refuses to be put to rest. Archaeologists such as Tony Secord; utilizes the .45 ACP in his dual Mauser C96 pistols; customized to his needs.