Re: Lead and Zinc?
You could remelt and flux the top with a lot of sawdust which will remove a lot of the impurities. Molten zinc is apparently highly toxic when heated to it's vapor point and is quite a bit higher than the ww melt temp. However; fluxing with sawdust will remove other impurities that can affect the overall quality of the finished cast bullet.
Life's too short to shoot an ugly gun.....