Pete--- You might want to look at Speer #12 or 14 Loading Manuals.

They both have reduced loads in 460S&W. Also an old trick some loaders

use in reduced loads is some type of filler to reduce the voids in bigger ctgs.

This is/was used when subbing smokeless for black powder. Notably in 45-70..

btw... ruggy is the ''460 guru''.. l have followed his advice for years on my 460 PC