7.65×20mm Longue

The 7.65×20mm Longue (also known as 7.65mm French Longue, 7.65 mm Long, 7.65mm MAS, 7.65×20mm, 7.65L and .30-18 Auto for use in the Pedersen Device) was a straight, rimless cartridge used in the French Modèle 1935 pistol, as well as the MAS-38 submachine gun.

7.65×20mm Longue
7.65×20mm cartridge (steel case and steel-jacketed bullet).
TypeRifle and Pistol
Place of originUnited States
Service history
Used byUnited States, France, Germany, Vietnam
Production history
DesignerRemington Arms
Case typeRimless, straight
Bullet diameter7.85 mm (0.309 in)
Neck diameter8.50 mm (0.335 in)
Base diameter8.53 mm (0.336 in)
Rim diameter8.50 mm (0.335 in)
Case length19.70 mm (0.776 in)
Overall length30.24 mm (1.191 in)
Primer typeSmall pistol
Ballistic performance
Bullet mass/type Velocity Energy
77 gr (5 g) FMJ 1,132 ft/s (345 m/s) 219 ft⋅lbf (297 J)


The cartridge was developed for the United States and secretly produced in quantity too late for its intended use during World War I. The United States scrapped the weapons built for the cartridge between the world wars.[1] France adopted weapons for the cartridge and those weapons saw combat use; so the cartridge is best known by its French name.

The French military were introduced to the cartridge when the US demonstrated the Pedersen device after the end of World War I in Le Mans and again when John Browning exhibited a carbine in the same caliber in 1920. The US .30 Pedersen cartridge (Auto Pistol Ball Cartridge caliber .30 Model of 1918 or .30-18 Automatic) used in the Pedersen device was the basis for the 7.65×20mm Longue. The cartridge dimensions were identical, although Pedersen device cartridges were loaded with a slightly heavier 80 grains (5.2 g) bullet which achieved a velocity of 1,300 feet (400 m) per second in the longer barrel of M1903 Springfield rifles.[1]

Remington Arms produced 65 million cartridges for the Pedersen device between 1918 and 1920.[1] French 7.65×20mm Longue ammunition was manufactured in quantity from approximately 1935 to 1960.

See also


  • Barnes, Frank C. Cartridges of the World 3rd Edition, 1972 Digest Books, ISBN 0-695-80326-3
  • Sharpe, Philip B. The Rifle in America 1958 Funk & Wagnalls, New York
  • Hatcher, Julian S. Hatcher's Notebook 1966 Stackpole Books, Harrisburg, Pennsylvania, ISBN 0-8117-0795-4


  1. Canfield, Bruce N. (2003). "Never in Anger: the Pedersen Device". American Rifleman. National Rifle Association. 151 (June): 58–61&71.
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