Aside form high powered stuff you can get away with pure lead bullet. See https://news.ycombinator.com/item?id=47771707 https://news.ycombinator.com/item?id=47

Aside form high powered stuff you can get away with pure lead bullet. See https://news.ycombinator.com/item?id=47771707 https://news.ycombinator.com/item?id=47771707 for the rest.