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8×22mm Nambu
Type Pistol
Submachine gun
Place of origin Flag of Japan.png Japan
Service history
In service 1904–1945
Used by Japan
Wars Second Sino-Japanese War
World War II
Production history
Designer Kijiro Nambu
Designed 1902
Specifications
Case type Bottleneck rimless
Bullet diameter 8.13 mm (Bad rounding hereScript error in)
Neck diameter 8.71 mm (Bad rounding hereScript error in)
Shoulder diameter 10.00 mm (Bad rounding hereScript error in)
Base diameter 10.23 mm (Bad rounding hereScript error in)
Rim diameter 10.50 mm (Bad rounding hereScript error in)
Rim thickness 0.92 mm (Bad rounding hereScript error in)
Case length 21.43 mm (Bad rounding hereScript error in)
Overall length 31.56 mm (Bad rounding hereScript error in)
Primer type small pistol
Ballistic performance
Bullet weight/type Velocity Energy
102 gr (Bad rounding hereScript error g) FMJ290 m/s (Bad rounding hereScript error ft/s)274 J (Bad rounding hereScript error ft·lbf)
Test barrel length: 117 mm (4.61 in)

The 8×22mm Nambu is a rimless, bottleneck handgun cartridge introduced in Japan in 1904. It was used in the Type A Nambu, Type 14 Nambu and Type 94 pistols, Tokyo Arsenal Model 1927, Type II machine pistol, Hino Komuro M1908 Pistol and the Type 100 submachine gun. It uses 8.2 mm (.320") bullets. Power is relatively low, with military loads developing about 280 J (200 foot·pounds), comparable to the American .380 ACP and substantially weaker than contemporary military cartridges such as 9×19mm Parabellum, .45 ACP, and 7.62×25mm Tokarev.

As per the fate of almost all contemporary Imperial Japanese weapon designs, the 8 mm Nambu production ceased after the end of World War II, as the weapons that fired it were removed from service. While some small-scale production (primarily using remanufactured brass) has occurred in the United States, handloading is common among owners of 8 mm Nambu pistols. New manufactured brass and copper plated lead bullets (.32o") are now available through HDS.

The Japanese Army cartridges in 8 mm Nambu have no markings on the headstamp unlike the Japanese Navy cartridges.

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