A couple years ago I needed a slug gun so I bought the same gun my dad had, an H&R single shot in 20 guage. Topped it off with a Cabelas Pine Ridge shotgun scope. Well the thing was a tack driver big time, it actualy shot better at 100 yards than my rifle. Well this year I went to sight it in, and its spraying slugs everywhere. I cleaned the gun and the same thing happened. I'm wondering if the rather cheap scope went south on me. I'm using Lightfield sabot slugs which used to be the most accurate ones I ever used. Howerever this year I notice after one shot the barrel is filthy inside with alot of particles. This concerns me because Archery season has been a disaster for me, so I'm gonna spend most of gun season scouting out hard to find areas. Now I can use my dad's gun yea, but I'd love to get my gun shooting straight. What would be your guess? I'm thinking the scope went bad. These Sabot slugs aren't cheap but would you get a couple different types and shoot them?