RE: 10 guage or 12?
While I own a couple of ten gauges, if I had to choose between a 10 and a 12 gauge I wouldn' t have to think twice. I would pick a twelve gauge with a 3" chamber. Ammo is easy to find and generally cheaper too.
I was looking at single shots again yesterday. Interestingly enough I see that this year Stoeger has come out with a hammerless single shot with screw-in chokes, which has a rib on the barrel that is grooved so one can attach sights to it. For turkey hunting that is a million dollar idea. My only concern would be this; I see that they list the gun at 5.4 pounds which would mean it would pack quite a punch as far as recoil is concerned. MSR was $119.00, not to bad!