I'm a fan of lead conicals, but you probably didn't buy that XR for lobbing big lead slugs. I would try the T/C 370 gr maxiball just for kicks, but also powerbelts, and probably a sabot or two. I've heard plenty of complaints about reloading difficulty after a few sabots are shot, but its really a one or at most two shot deal wit muzzleloading. I like the idea of a boresized bullet more than a sabot, but to each his own.

I'd start at 80 grains of loose pyrodex and work on up. I don't see the need to go past 100 gr, but some guys do it and have good results. You can probably find a load that works well with most bullets.

As for range, "they" say you can shoot out to 200 yds with 150 gr of powder, but I still haven't shot that far with a rifle, forget about a muzzleloader. I shoot most of my deer at less than 50 because of the places I hunt. My load of a 435 gr maxiball over 100 gr pyrodex really wilts 'em. I would shoot out to 100 yds with that load.