My gun is a hunter mostly,however I do load practice loads and a few "plinkers".
My hunting load is a 440gr WFNGC (hardcast) from Cast Performance. I also load a Power Belt muzzle loader bullet (245gr Aerotip)as a trainer/plinker. These are too expensive to buy but I got a whole bunch of them from a buddy that was giving up hunting with a muzzle loader.
You simply push the belt off the bullet and load normally. It does squash the tip down a little,but at the distances that I shoot (<50yds) it does no effect accuracy.
If you do find a gun let me know and I will tell you how I set mine up to handle the recoil and make it more accurate. --- SAWMAN
AdDED: My gun also loved the 350gr Hornady XTP's.