Point of interest is that Pelletized powder, scopes and sabots are only illegal in CO during the actual Muzzleloader season. If you are using a muzzlestuffer during regualr firearms season, you can use whatever you like, including a scope. I'd go with a heavier Powerbelt, and back off the powder a bit. I found that at 100 yards, a 245 Aero-tip PB with 2 pyrodex pellets performs/expands well. Try backing off on the charge a bit, it might help.