I just got one a week ago so I haven't done much testing, but so far I'm getting ok results with 80 grains of Pyrodex Select, a lubed felt wad, and an unlubed Lee 250 grain REAL bullet over the wad. When I lube the bullet I actually get worse accuracy. The lubed wad does seem to keep fouling in check fairly well, but I'm also swabbing between shots with a damp patch.
I'm getting about 3" groups from the bench at 50 yards, but that's with the factory sights and using a target that was neon green against a white backer. I think I could do better with a black target that had more contrast.