I've got one of those, great gun. 200 yard accuracy easy, even with pellet ammunition and power belts.
It's actually one of my current favorite things to shoot. I load with a .490 patched round ball, and 40-50 grains of powder, and 50 yard plinking is a blast.
100 grain powder over a 250-300 grain bullet is an absolutely devastating round, with an acceptable trajectory.
They also have surprisingly good triggers, mines super crisp and clean, straight from the factory.