I've been loading and shooting the Montana Precision Swaging 535gr Postell bullet (.458 dia) in my Pedersoli 1874 Sharps and really like it. These bullets don't seem to be available now and may not be for some time, if I'm reading between the lines correctly? (Not available; no backorder)
I do have a new Lyman Postell mould, but not sure which lead alloy to use for casting this boolit. Midway sells casting lead as well as Rotometals. Any suggestions from either place?
FWIW, MPS says their Postell is 20:1 alloy, 9.25 BH