Tighten screws on bottom of barrel where forearm attaches,new Warne mounts.Burris Signature 1.5x6.Last year the best groups I could get at 100 yards was 4-5 inches with three 50 grain pellets,had to drop back to two 50 grain pellets and settle for 2-3 groups at 100 yards.This year with new monunt,tighten screws shooting three pellet with 250 Shockwave,MV 2138,one inch groups at 100 yards three inches high,with 3 inch groups at 200 yards three inches low.I think most of my problem last year may have been the loose screws.Now I have a 200 yard muzzle loader like I though I purchased last year.