Geez! What does the HEAD STAMP say? Should be something on the bottom of the rifle round. Cartridge guesstimation has ruined many a gun (not to mention shooter). Best bet is to take it to a gunshow and sell it to an ammo dealer. Then the ID is his problem, as well as shootability, etc. Only other way to be sure is an exact translation. Even then, if the boxes aren't sealed, you don't know if they are reloads. Inherited a bunch of ammo from my uncle and quite a bit were very, very old reloads stuffed back into the original boxes. Won't shoot those since I don't know the loads.