I'm looking for the best alloy to use in casting lead boolits for my 45-70. They will be used in low-velocity (trail Boss) plinking loads. I have a 400 gr. HP lee mould and a 500 gr. RN for use with gas checks. I also have a 250 gr. Maxi mould for 45 front-stuffers that I haven't miked. If it's close to .458, I may try some of those as well, and maybe Round Ball.