.45 Remington–Thompson

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.45 Remington–Thompson
Place of origin Experimental military round
Production history
Designed 1923
Parent case .45 ACP
Bullet diameter .447 in (11.4 mm)[1]
Overall length 1 inch[citation needed]
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)

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.[2][3] While some variants of the 1923 were produced, the rifle and round did not find commercial success.[3]


  1. ^ a b Frank C. Barnes (2014). Cartridges of the World: A Complete and Illustrated Reference for Over 1500 Cartridges. "F+W Media, Inc.". p. 519. ISBN 978-1-4402-4265-6.
  2. ^ a b c Daniel D. Musgrave; Thomas B. Nelson (1967). The World's Assault Rifles and Automatic Carbines. T. B. N. Enterprises.
  3. ^ a b Ned Schwing (2005). Standard Catalog of Military Firearms: The Collector's Price and Reference Guide. Krause Publications. p. 369. ISBN 0-87349-902-6.