Can a .303 be fired in a 7.7 jap rifle?

By now, it should be realized that stories about how some military cartridges could be fired in guns chambered for different ones are almost entirely inaccurate. There is no way that cartridges like the .30-06, 7.62 x 54R, 7.62 x 51 or 7.62 x 39 could be fired in the same weapon without at least changing the barrel (and probably doing a lot more in the case of automatic guns). The only partial exception is where cartridges have been given different names in different countries: so the .303" Britishicon will chamber in World War 2 Italianicon and Japaneseicon 7.7 x 56R weapons and vice versa – because it is in fact the same cartridge. However, even then there is no guarantee that automatic weapons will function properly (or that all rounds will be safe to fire in all weapons), as the pressure characteristics of the cartridge loadings may be different.

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