I got a t/c 45csl Hawkins , I picked it up for 75 bucks a couple years a ago , bore looks to be clean with decent rifling , I have taken two deer and s coyote with it to date .here in tn muzzleloader season is about to begin,I went to but a few patched round balls Dow range this week and wow the deer couldn't be safer . At 25 to 50 yards it was shooting high with sights bottomed out . At 100 yards I coundnt keep the bullets in a 3x3 foot square .the was hitting high, low , left and right . I was shock cause in times past it has shoot well .orginal load was .445 ball . 70 gr of 3f bp, and a pillow ticking patch after the poor range performance i tryed different powder charges and patching . With no improvement . What to do or try next ?