For about 2 months, I've been trying to get my CVA Kodiak sighted in. At first, things were going along o.k. with 2" groups @ 50 yds. However, my groups progressively got larger and larger. Now, I'm not getting any sort of accuracy whatsoever. Today I bore sighted twice and ended up stapling 6 18"X18" target side by side to figure out where the rifle was impacting. When I did get a hit, I aimed at the same bull and sure enough, that shot went somewhere else. Keep in mind this is 25 yds away. I've gone through two scopes and tried rifled sights. Tried sabots, powerbelts, and maxihunters. Could the powder possibly be bad (pyrodex)? I swab the bore between shots. Gun is cleaned when the day is done, always. The only thing consistent with the gun is that it shoots WAY the hell off to one side. Help.