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It come out to .308 in the 7.62x51 cartridge. "30 calibre" is typically used to refer to that cartridge or the US .30-06 (7.62x63) cartridge. Not all cartridges labeled as 7.62 are the same diameter, however - due to different measuring methods, the Russian/Soviet 7.62x39 and 7.62x54R are considerably larger - the true bore diameter is actually 7.92mm (.312)

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14y ago

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