I had really good luck with a 300 grain XTP with 100 grain of Pyrodex RS and Klean bore primers .

http://img.photobucket.com/albums/v636/rgkempton/Muzzle%20loaders/DSCN0019-1.jpg

I am having trouble with my Encore at the moment, not locking in all the way and loose hinge pins so my groups went to Hell . But i hope to get that corrected and be back at it .