I've been asked to cast some boolits for friends with .45 and larger BP rifles.
I asked them what hardness they wanted and one got this nog grin and said 'as hard as possible for as long as possible". <SIGH>.... and there I was trying to be helpfuul.
I think I know what to do, but I'd like to hear some thoughts from the grand masters of castology before I go alloying up a batch of material. What alloy (Brinell) would you use?