Has anyone had success with a Win SX2 with factory slug barrel? I picked up an SX2 a couple years ago that I otherwise love. It came with a slug barrel and I can't make it shoot a group any tighter than about 12". At first I thought it was the scope I had. Then I took the scope off and was using open sights. Even at 25 yards it doesn't shoot any sort of group. And yes, I know how to shoot. Just curious if it's just a lemon or what? The gun shoots great with the regular barrel.