I have a 12 ga Rem 1100 slug gun and a 20 ga 870 slug gun. I'm going to bring one for bear protection and as a backup if my rifle scoope gets "bumped". I'm hunting over bait so distance wise it would be ok. I'd rather carry the 20 ga.( shorter lighter quicker). Both are scoped. Anybody have any thoughts on 20 vs 12. the 20 still makes a big hole, not a lot of difference in veloicity. 12 is 1/8 heavier.