7×20mm Nambu

Type

Pistol

Place of origin

Service history

In service

1929-1945

Used by

Japan

Wars

Production history

Designer

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. 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.