(Redirected from 8x22mm Nambu)
8×22mm Nambu
TypePistol
Submachine gun
Place of originJapan
Service history
In service1904–1945
Used byJapan
WarsWorld War I
Second Sino-Japanese War
World War II
Production history
DesignerKijiro Nambu
Designed1902
Specifications
Case typeBottleneck rimless
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/typeVelocityEnergy
102 gr (7 g) FMJ290 m/s (950 ft/s)274 J (202 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.

History[edit]

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 (.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.
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 (primarily using remanufactured brass) 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 (.320') 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.

See also[edit]

  • .32 NAA, a .380 ACP case necked-down to hold a .32 caliber bullet with the goal of improved ballistic performance over the .32 ACP.
8mm
Retrieved from 'https://en.wikipedia.org/w/index.php?title=8×22mm_Nambu&oldid=885454204'

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