Welcome to the forum!!!
My load for my Knight is 80grs FFF Goex behind a Hornady 300gr .429 XTP hollowpoint...
Just because a muzzleloader can safely handle more powder does not mean that is the most accurate load...With this load I have killed deer and had pass throughs out to 147 lasered yards...
Think about the 45-70 and how many buffalo were killed with it...When it came out the standard load was 70grs FF black powder behind a 405 lead bullet and thousands if not millions of buffalo were killed with this round...
Have fun!!!