my cva firebolt .45 in-line muzzleloader rifle isnt accurate anymore-i thought i would see if anybody has an idea b-4 i have to go deeper in debt by buying a new muzzleloader-i bought it new in 2003-it always held good groups at the shooting range using 2 pyrodex pellets and 180 gr. hornady sabot-but at the range last month,groups were spread 8-12 inches at 100 yards-ive tried everything i can think of-i soaked the barrelwith blk pwdr/plastic solvent overnight,and scrubbed it out as clean as it can get,using patches and wire brush-my leoupoldscope may as well be welded on the rifle,thats how tight all the screws are-i tried another scope,no luck-i tried t/c sabots,no luck-powerbelts,no luck,disasembled rifle and inspected closely,no luck-cva has a replacement barrel for the firebolt for $80-i wonder if i should order a barrel or just give up on cva,and dig myself deeper into the debt hole by purchasing a whole new rifle of a different brand-any ideas?thnx