[Unclenick]

I've read those before. The first one is where I found the link to the solder page. I'd forgotten that.

Arcticbreeze got 4lb, 9 oz of sulfur/zinc slag from 40 lbs of contaminated lead. That's about 11.4% of the total weight. Well above the alloyable 1.6%. I'd be very surprised if his one-pass sulfur treatment got the zinc quantity down to a very small fraction of a percent, so I suspect the concerns over hundredths of a percent of contamination are exaggerated. It might even be true that the alloyed 1.6% is acceptable and only the excess zinc beyond that which hardens ahead of the alloy causes the problems. I've certainly seen fairly accurate zinc castings, (zinc wheel weights, for example) so it's not like the metal itself is not castable. It would be interesting to see an analytical assay of his final bullets.