I understand pure lead is a must for muzzleloaders and I'm sure this was talked about but I'm new to muzzleloaders and casting. I have my share of pure lead and hundreds of reals casted and roundballs for hunting. I was given 60 pound of stick on wheel weights and probably the same in clip ons. the rest are zinc which I know are useless. My question is can I use them for target roundballs or cast 45 cal and use the plastic sabots in a 50 cal. I melted some to ingots and can still put a groove in it with my fingernail but it's still harder the pure lead. Any info would be great so I know if I can still use it. I can't even get pure lead at the 3 scrap yards in my area.