My friend uses a pump 10 gauge, and that has made me think maybe I should, too. Last spring he shot two toms with one shot, and said they both went down instantly, and hard. Then he shot another tom, similar result, down instantly, and hard.

The only downside I see is it weighs about 2-3 pounds more than my SBE 12 gauge, so it is a lot to lug if you're doing a lot of run and gun. But I think that in a day's turkey hunting, I probably sit at least twice as much as I stand or walk, so I'm leaning towards getting some kind of 10 gauge myself.