Anyone have load info using MZ in a 50-70? I have a ruger #3 action that has been rebarreled to 50-70govt. I have a bottle of Blk MZ and would like to shoot it up in my 50-70. I have 450grn govt bullet from the Lee mold. I emailed Allient and they merely replied they have no load data for this cartridge. Seems odd. If a guy typically loads say 65grns of FFG Goex, would a similar load of MZ be used? Any guidance would be helpful.