Like most inlines they are going to tune in with a powder charge between 80-110 grains of powder. Get some Pyrodex RS and start at 80 grains. Be sure to swab between shots. Get some 240 gr XTP, 250 grain Shockwaves, and 300 grain XTP and a pack of powerbelts. One of them is going to shoot good. Also start your testing close.

I saw a person testing his rifle with open sights at 100 yards once. He was furious that it would not group. I told him it was kind of hard to make it groups since the average group at that distance is about 3 inches. I suggested he move to the 25 yards line. He ignored my advise and constinued to shoot up his powerbelts until they were gone and then declared his rifle did not like them.