RE: Can't get my Winchester 1300 to group slugs?
No matter what the problem is I would definately lose the BSA scope and get a Nikon Pro-Staff 2-7x 32mm shotgun scope. I have one mounted on a Rem 870 slug gun. When mounting on a slug gun get the Prostaff made for shotguns. They have more eye relief and parallax is set for 75 yards.