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'timber' 'bearhunter' brings up a good point, with millions of these rifles having been produced it could be anyone of an assortment of calibres, post war 'refurbs', might be best to let a gunsmith look at it before buying any ammo....it 'may' be stamped with the cal. on the recever/barrel I have a Israeli K98 stamped 7.62 but one never knows......