Bullet diameter .447 in (11.4 mm)
|Parent case .45 ACP|
Overall length 1 inch
|Place of origin Experimental military round|
The 45 Remington–Thompson 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. While some variants of the 1923 were produced, the rifle and round did not find commercial success.