I discovered information about tin. Pure tin has a hardness of about 5, like pure lead, and that is what Rotometals sells. Lead free solder is 97% tin and 3% copper and has a hardness of 15. When you folks are adding tin to your melt, are you adding the pure soft tin or tin solder ?? I'm making a 40 to 1 alloy for .357 hunting boolits. Those boolits will be travelling about 1200 FPS out of the Handi-rifle, about the same as a 22LR so barrel leading isn't a huge concern. I have a 173 Gr. .359 GC Hammer mould coming from MP moulds for this rifle boolit.
Ohio Rusty ><>