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While the Type 99 design is one if the strongest of all military rifles, individual rifle quality can depend on the date of manufacture. Late-war rifles were not of the quality of earlier production (I’m not talking about the cast iron parade rifles), so some knowledge of the individual rifle’s history is a good-to-know. Nine different armories built Type 99s, so there were inevitable build variations. Bore dimensions also varied widely, from .310” to .317”. These are reasons for the low-pressure loading data.

Chances are that the OP’s rifle is plenty strong, but has he checked the headspace? Done a chamber cast? Slugged the bore? Run a bore scope through it?



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