I've loaded for several Freedom Arms 454's and have used the load data on their site with good results. They list data for a variety of powders and pressure levels that may be useful to you.
Edit to add - their data is listed for their own jacketed bullets so maybe that isn't what your after. I currently load for a FA 83 454 and only shoot cast bullets anymore and don't load for maximum velocity. I use more 4227 and HS 6 than any other powder...
Last edited by JGray; 12/07/19.
