I too am looking to get into Turkey hunting, but I decided not to go the shotgun route.
Down here from what I've read you can use rimfire ammo for turkeys, so I ordered a Savage arms Mark II-FV to use for Turkey hunting. It's not optimal, but I'll tell a little story to help explain why.
About 2 years ago I was invited as a guest to Oxford University. I had lunch in some special faculty and doctorate-type dining hall. They served some kind of bird.... I don't remember.
I do remember chewing and biting down on something hard. I didn't know what it was (knew nothing about hunting at the time). I asked the lady I was with what it was and she said, "Shhhh... That's shot. Don't say anything or make a scene" (as if I cared enough to make a scene over it?)..... anyways, as I continued on, I found more and more BB's. What they were made of I don't know, but I do know it made the meal very difficult.
So I decided to try to go the single shot route for Turkey hunting.... and anything beyond .22lr seemed like overkill (I'm hunting it - not blowing it up!). So long as I get a good shot, I'm thinking it will work.
Just need to get a good scope and get fast with the rig practicing with some turkey targets at the range.