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Our commie pals called the 7.62x39 ball the 7.62mm M43 cartridge. No army using it calls it by it's full metric designation.
Likewise, the Red Army (and Russian Army of today) called the 7.62x54R the M91 cartridge. As a side note, the Czechs called it the 7.62mm M59, in light and heavy ball sub types.