.45 Colt

.45 Colt
Type	Revolver
Place of origin	United States
Service history
In service	1873–1892
Used by	United States
Wars	Indian Wars, Spanish–American War, Philippine–American War, Moro Rebellion
Production history
Designer	U.S. Army
Designed	1872
Produced	1873–present
Variants	.45 Colt +P
Specifications
Case type	Rimmed, straight
Bullet diameter	.452 in (11.5 mm)
Neck diameter	.480 in (12.2 mm)
Base diameter	.480 in (12.2 mm)
Rim diameter	.512 in (13.0 mm)
Rim thickness	.060 in (1.5 mm)
Case length	1.285 in (32.6 mm)
Overall length	1.600 in (40.6 mm)
Case capacity	41.60 gr H2O (2.696 cm3)
Rifling twist	1 in 16 in (410 mm)
Primer type	Large Pistol
Maximum pressure (CIP)	15,900 psi (110 MPa)
Maximum pressure (SAAMI)	14,000 psi (97 MPa)
Ballistic performance
Bullet mass/type Velocity Energy 160 gr (10 g) TAC XP, Double Tap 1,125 ft/s (343 m/s) 450 ft⋅lbf (610 J) 200 gr (13 g) JHP, Buffalo Bore 1,000 ft/s (300 m/s) 444 ft⋅lbf (602 J) 250 gr (16 g) Nosler JHP, Double Tap 900 ft/s (270 m/s) 450 ft⋅lbf (610 J) 300 gr (19 g) JSP +P, Cor-Bon 1,300 ft/s (400 m/s) 1,126 ft⋅lbf (1,527 J) 360 gr (23 g) Nosler JHP +P, Double Tap 1,200 ft/s (370 m/s) 1,151 ft⋅lbf (1,561 J)

The .45 Colt (11.43×33mmR), is a rimmed, straight-walled, handgun cartridge dating to 1872. It was originally a black-powder revolver round developed for the Colt Single Action Army revolver. This cartridge was adopted by the U.S. Army in 1873 and served as an official US military handgun cartridge for 19 years, before being replaced by the .38 Long Colt in 1892.