I have been using Federal slugs for a long time. I use an old H&R 12 Gauge when I have to go into a shotgun area. I have a scope on mine, but the barrels had much thicker steel back in the 30's. I don't know about mounting a scope on a newer model because the barrels are really thin. The cheapest way to go is some type of rifle sights. They would make a big difference.