I had a Lyman Great Plains Hunter 1:32 that shot T/C Maxiballs and 320 gr REAL bullets really well out to 75 yards. That's as far as I ever shot them.
A while back I used to shoot 250 REALs out of my T/C Hawken 1:48 and took a few deer with them.
But each muzzleloader is different and likes different bullets and powders/charges. That's the fun of BP. Getting to play with them and see what each one likes.