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Prvi 7.62x54R has lead cores, so the bullet will compress inside the .3085" bore of the M28/30.
As Leon states, a .310 lead core bullet will compress going thru a .3085 groove diameter rifle.
I keep writing this, but according to 1931 Civil Guard and 1965 Finnish Defence Forces blueprints, the groove diameter of unmodified m/28-30 barrel is 7.83mm + 0.04mm (anything between .308 and .310 in). The bore diameter is 7.59 mm + 0.04 mm (anything between .299 and .300 in).
 
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