The outward dimensions fit the Nambu chamber, but the inner configuration was a straight bore all the way to the flash hole the diameter of the bullet. In 1946, two collectors in Minneapolis had carridges made on screw machines from a form of Naval Bronze bar stock. Smith both had obtained specemins of the early 8mm round and were not aware of the newer ballistics (in their books, at any rate.) Later writers like George Nonte went by what these earlier writers had said in print and nothing with modern ballistics existed regarding the 8mm Nambu until quite recently. It is interesting to note that General Hatcher and W. While these newly upgraded cartridges would not cause a catastrophic failure of the Papasan and Ojisan Nambu pistols, they were hard on the actions and resulted in early recoil spring failure. In 1929 the Japanese began loading the 8mm Nambu pistol cartridge to higher velocity allowed by the T-14 pistols having 2 recoil springs.
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