Years ago I got a load of surplus ammo crates that were tin lined. I've got a lot of sheet tin, and melted down metal from lids and odd corners. As a result, I have a lot of tin ingots to use in the future to make pewter for casting nosecaps, tomahawh handle bands and such. Meanwhile, I cast up a bunch of tin balls to try as PRB's. They work OK, but have much more drop out at 100 yards than pure lead. I suppose tin would work fine for buckshot-type loads in a smoothbore.