7×20mm Nambu

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
Specifications
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, and is ballistically similar to the .32 ACP.^[2]

References

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. "Nambu World Ammunition & Reloading Page". Retrieved 2009-07-05.