8×22mm Nambu


The 8×22mm Nambu is a semi-rimmed, bottleneck handgun cartridge introduced in Japan in 1904.

History

It was used in the Type A and B Nambus, 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 bullets. Power is relatively low, with military loads developing about 280 J, 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.
Like almost all of the Imperial Japanese weapon designs of that era, production of 8 mm Nambu ammunition ceased after the end of World War II, as the weapons that fired it were removed from service. Some small-scale production has occurred in the United States, but handloading is more common among owners of 8 mm Nambu pistols. New manufactured brass and copper plated lead bullets are now available through HDS. Reloadable cases might be formed from.40" S&W, but this would require swaging the case heads down from.424" to.403" in a hydraulic press. A regular reloading press would quickly be ruined by this sort of operation.
The Japanese Army cartridges in 8 mm Nambu have no markings on the headstamp unlike the Japanese Navy cartridges.