| 8×22mm Nambu | ||
|---|---|---|
| Type | Pistol Submachine gun |
|
| Place of origin | Japan | |
| Service history | ||
| In service | 1904–1945 | |
| Used by | Japan | |
| Wars | Second Sino-Japanese War World War II |
|
| Production history | ||
| Designer | Kijiro Nambu | |
| Designed | 1904 | |
| Specifications | ||
| Case type | Bottleneck rimless | |
| Bullet diameter | 8.18 mm (0.322 in) | |
| Neck diameter | 8.73 mm (0.344 in) | |
| Shoulder diameter | 9.86 mm (0.388 in) | |
| Base diameter | 10.32 mm (0.406 in) | |
| Rim diameter | 10.50 mm (0.413 in) | |
| Case length | 21.25 mm (0.837 in) | |
| Overall length | 31.75 mm (1.250 in) | |
| Primer type | small pistol | |
| Ballistic performance | ||
| Bullet weight/type | Velocity | Energy |
| 102 gr (6.6 g) FMJ | 290 m/s (950 ft/s) | 274 J (202 ft·lbf) |
| Test barrel length: 117 mm (4.61 inches) |
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The 8×22mm Nambu is a rimless, bottleneck handgun cartridge introduced in Japan in 1904 for the Type A Nambu pistol. It was also used in the 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. Some small-scale production has occurred at various times in the United States for use in captured Japanese pistols, but the expense of these rare cartridges makes handloading common among owners of 8 mm Nambu pistols, although brass and custom ammunition are sometimes found, and as they are much less expensive, the situation eases for owners.
The Japanese Army cartridges in 8 mm Nambu have no markings on the headstamp unlike the Japanese Navy cartridges.
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