What does Henry say about loading over SAAMI spec?
Keep zinc out of lead alloys....it contaminates the mix and ruins a pot of metal. The bullets cast from zinc contaminated lead never fill out properly and have wrinkles.Two points here. If you are not an experienced bullet caster, why are you giving casting advice? Also, it is not 20% Zinc that the friend is likely using. It is more likely (up to) 2% Tin...a big difference in the result.