I'm having difficulties with my CVA muzzleloader. It's a CVA Kodiak .50cal. I honestly can't get it to hold 6-8" groups at 100 yards. Shooting 250gr T.C. Shockwave sabot bullets with 100 grains of Triple 7 pellets. I cleaned it about every 4-5 shots, but it seems to be the same- clean or dirty. Is it just me, or can I be doing something wrong?