7×20mm Nambu
Type Pistol
Place of origin Flag of Japan.png 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 (Bad rounding hereScript error in)
Neck diameter 7.64 mm (Bad rounding hereScript error in)
Shoulder diameter 8.62 mm (Bad rounding hereScript error in)
Base diameter 8.91 mm (Bad rounding hereScript error in)
Rim diameter 9.11 mm (Bad rounding hereScript error in)
Rim thickness 0.98 mm (Bad rounding hereScript error in)
Case length 19.80 mm (Bad rounding hereScript error in)
Overall length 26.80 mm (Bad rounding hereScript error in)
Primer type Small pistol
Ballistic performance
Bullet weight/type Velocity Energy
56 gr (Bad rounding hereScript error g) FMJ240 m/s (Bad rounding hereScript error ft/s)108 J (Bad rounding hereScript error 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, and is ballistically similar to the .32 ACP.[2]


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