Nothing. I was trying to get them that way and was unsuccessful that casting session.Whats wrong with frosty bullets???
are those trees anything like oak and mesquite and pine?IMO, frosting is from two things; slow cooling bullets and more antimony than tin in the alloy. At less than 5% tin and antimony, as the bullet cools first the antimony solidifies, then the bi-metal tin/antimony and lastly the lead. If the iron mould is hot, the antimony forms the dendrite trees larger before the tin/antimony crystals form around it. Then any remaining tin/lead encloses the bullet.
I have few aluminum moulds, so don't have much experience with them. Brass and bronze mould have less frosting appearances.
I like frosty handgun bullets, as there is less chances of leading if you go to heavy on the powder.
That's my luck too. Not that I try to get frosty but I'll go a couple sessions without seeing any, then I start seeing them every cast. In my case this is when using an Accurate Mold in aluminum. The frosty bullets are about as perfect as I can cast and the alloy would be COWW and pure with some tin added. This particular batch of COWW was a 500 lb batch and was hard as woodpecker lips so I suspect it contains quite a bit of antimony.Nothing. I was trying to get them that way and was unsuccessful that casting session.
After you slice, polish and acid etch, they look most like pine trees under the microscope. FWIWare those trees anything like oak and mesquite and pine?
HA HA