8×22mm Nambu

8×22mm Nambu
Japanese military pistol cartridge.
TypePistol
Place of originJapan
Service history
In service1904–1945
Used byJapan
WarsRusso-Japanese War
World War I
Second Sino-Japanese War
World War II
Production history
DesignerKijirō Nambu
Designed1902
Specifications
Case typeBottleneck, semi-rimmed
Bullet diameter8.13 mm (0.320 in)
Neck diameter8.71 mm (0.343 in)
Shoulder diameter10.00 mm (0.394 in)
Base diameter10.23 mm (0.403 in)
Rim diameter10.50 mm (0.413 in)
Rim thickness0.92 mm (0.036 in)
Case length21.43 mm (0.844 in)
Overall length31.56 mm (1.243 in)
Primer typeSmall pistol
Ballistic performance
Bullet mass/type Velocity Energy
6.6 g (102 gr) FMJ 315 m/s (1,030 ft/s) 328 J (242 ft⋅lbf)
Test barrel length: 117 mm (4.61 in)

The 8×22mm Nambu is a rimless, bottleneck handgun cartridge introduced in Imperial Japan in 1904, used in the Type 100 submachine gun, Nambu pistols (Type A, the Type B and Type 14) and the Nambu Type 94 pistol. The 8×22mm Nambu cartridge was used in both the Pacific War and Second Sino-Japanese War.