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It should be chambered for the 7.7×58mm Arisaka cartridge, aka: 7.7 Jap (Japanese).
The actions were very strong, and the cartridge on a par (power-wise) with the German 8x57 (7.92mm) & US .30-06, so when loaded with soft-pointed ammo, are very effective on most N.A. big game - although the military rifle's sights may not.
The large round knob @ the rear of the bolt is the rotary safety, BTW.
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