I have a TC Renegade 54 cal.It is about 15 years old .It always shot good groups.Most years I would shoot pirodex with maxiball or maxi hunter.This year I bought clean shot powder and powerbelts for something new.The more I shot the worse my groups became.Even after cleanings and switching back to the pirodex and maxiballs my groups are terrible.I have an aimpoint electronic dot for my scope.Yes the screws are tight.Is it my gun OR my scope??