There's no pat answer here,Guyon. just some guidelines.
There's extra full tubes out there, both factory and aftermarket, but sometimes, in SOME bbls, a plain full choke will give a tight but even pattern. And, loads can make or break your hunt, there's no hunting more dependent on proper patterning.
Set up at 25 yards, and use a full or extra full for turkey tube. Pattern a few loads,and see what ones produce the best patterns in your shotgun. Then, go to a tighter or looser choke and see what happens.Repeat at 40 yards.
A cheap patterning target....
Grab a sheet of typing paper and a pencil. Make a fist with your non writing hand and lay it on the paper, thumb side up. Trace around it, and Voila! A silohuette of a turkey head and neck.What you want is the load and choke that puts the most legal shot in that area.
Here in Md, only 4,5,and 6 shot are legal. Check your local laws and regs.
I'm no local legend among the turkey experts. My setup uses a Extra full Colonial tube and the Remington Duplex 4X6 load.
I think I have a Remchoke Extra full tube I'm not using. If you want to try it out, E me. No charge....