Can 7.62X51 ammo be fired from marlin 30-30 rifle?

Answer 1

sure, once! But the pieces left wouldn't be in good shape. Nor would your face be.

THAT WAS SARCASM!! NO!!! DO NOT PUT CARTRIDGES DESIGNED FOR ONE RIFLE INTO ANOTHER - - the .30-30 is an older, lower pressure round, and it has a rimmed cartridge (the bottom rim of the ctg. sticks out further than the body so it can be grabbed and pulled out of the Marlin's chamber). The .308 (7.62X51) is rimless, so there's no way to pull it out of the chamber, even if you could Force it to go in, which I doubt, because the .30-30 is .401 inch at the shoulder and the 7.62X51 is .454 inch at the shoulder. There are other size problems as well - - think of putting your size 9 WIDE foot into a size 8 NARROW shoe if that helps you picture it.

If you managed to get a 7.62X51 round into your .30-30 and pulled the trigger you'd likely get a face full of metal. If you want to be maimed for life, ask a friend to hit you with a claw hammer - - don't ruin a perfectly good old rifle in the process.