I have a couple of hundred pounds of mixed alloy lead, ( some #2, some ww, ...) I am only casting lead for muzzle loaders currently and would like to remove as many other metals as possible from the lead alloy as possible. Haven't been able to flux the other metals out with paraffin or sizing lube. Any suggestions? Oh , by the way, I started casting about 1980 so I'm not new to this.