7×20mm Nambu

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7×20mm Nambu
Type Pistol
Place of origin  Japan
Service history
In service 1929-1945
Used by Japan
Wars World War II
Production history
Designer Kijiro Nambu
Manufacturer Koshikawa Arsenal
Case type Bottleneck rimless
Bullet diameter 7.08 mm (0.279 in)
Neck diameter 7.64 mm (0.301 in)
Shoulder diameter 8.62 mm (0.339 in)
Base diameter 8.91 mm (0.351 in)
Rim diameter 9.11 mm (0.359 in)
Rim thickness 0.98 mm (0.039 in)
Case length 19.80 mm (0.780 in)
Overall length 26.80 mm (1.055 in)
Primer type Small pistol
Ballistic performance
Bullet mass/type Velocity Energy
56 gr (4 g) FMJ 240 m/s (790 ft/s) 108 J (80 ft·lbf)
Test barrel length: 83 mm (3.25 in)

The 7×20mm Nambu is a rimless, bottleneck handgun cartridge designed in Japan for use in the Type B or "Baby" model Nambu pistol.[1] The cartridge is a scaled-down version of the 8×22mm Nambu used in all other Nambu pistol models. It has a muzzle energy more than a .25 ACP and close to the .32 ACP.[2][3][4]


  1. ^ Miller, David (2007). Fighting Men of World War II, Volume I: Axis Forces—Uniforms, Equipment, and Weapons. Stackpole Books. p. 276. ISBN 0-8117-0277-4. 
  2. ^ "An Introduction to the Military Handguns of Imperial Japan". Gun Digest 2010. Krause Publications. 2009. 
  3. ^ Dave Maccar (2016). Handguns & Handgun Shooting. p. 88. ISBN 1440246106. 
  4. ^ T J Mullin (2015). 365 Guns You Must Shoot: The Most Sublime, Weird, and Outrageous Guns Ever. p. 167.