He said he pulled them from a Lee mold and then powder coated them. So he made his own bullets by casting lead. It is sometimes typical to powdercoat them to help all sorts of things like feeding, keeping barrel leading down, don't get lead on your hands when handling, etc. All sorts of color can be used. I like the bright blue as that is what a lot of big bore training rounds are colored to distinguish them from the 'extra killy' real ammo.Pardon the ignorance buy why the the tips blue?