.45 Remington–Thompson

The .45 Remington–Thompson (11.4x25mm) was an experimental firearms cartridge designed by Remington Arms and Auto Ordnance for the Model 1923 Thompson submachine gun, a variant of the Model 1921 with a longer barrel, with the intent of increasing the power and range of the weapon.^[2][3] While some variants of the 1923 were produced, the rifle and round did not find commercial success.^[3]

.45 Remington–Thompson
.45 Long cartridge for the Thompson M1923 experimental SMG
Place of origin	Experimental military round
Production history
Designed	1923
Specifications
Parent case	.45 ACP
Bullet diameter	.447 in (11.4 mm)[1]
Case length	1 in (25 mm) (about 1⁄8 in (3.2 mm) longer than the .45 ACP)
Ballistic performance
Bullet mass/type Velocity Energy 250 gr[2] 1,450 ft/s (440 m/s)[2] 1,165 lb⋅ft (1,580 N⋅m)[1]
Test barrel length: 14 in (356 mm)

Headstamp for the .45 Remington-Thompson cartridge.

See also

• 12 mm caliber
• List of handgun cartridges