You can pick up Russian copper washed steel cased ammo for the Mosin cheap ($75ish for 440 round spam can). It's surplus ammo and shoots pretty well generally, just make sure you clean the rifle well after shooting the stuff as it's corrosive. This stuff is the only thing I shoot in my Mosin, it's cheap which means I can shoot a lot of it when I'm so inclined. Only issue I see with buying a Mosin is it will lead to other Mil-Surp guns and more $$$ out of pocket. Oh well, can't take it with you anyway.