That's true, I forget most people hunt open fields. My 12-gauge turkey and pheasant shell are the same. I've only shot two with 20 gauge 3 ''. My favorite set up is a 20 double with one 2.75 for under 30 and a 3" over 30. I try and not hunt farm fields and make them hunt me if possible. Most of my birds are 20 yards or less. Thier last thought is what the hell are those two littel black holes!I realize this is off topic, but I wouldn't want to use a lightweight shotgun for turkeys, solely because of magnum shells and recoil. I tried using my Monty once for turkey loads and that was awful. It kicked like a mule. IMO you're better of going with a heavier shotgun for turkeys, one that helps reduce the recoil from using a magnum turkey load.
I use a Benelli Supernova in camo pattern for turkeys. It has a comfortech recoil system built into the stock and really helps reduce the recoil from shooting cannon-style loads at turkeys.