rugar, The tube's not the most important thing, it's the pattern you get. Get a full or extra full choke tube and pattern your gun with different shells. It can get expensive trying lots of shells , so sometimes you can share the cost with friends and all pattern at the same time. Don't go into it with any pre-conceived notions. You might find out Remington copper plated 4s work best in one gun and Federal plain lead 6s work better in another gun. You have to try everything in all different shot sizes and loads to find out for sure.
Pattern at 30 yards and then at 40 yards. You might find out just about anything will work at 30 yards, but not all loads will be sufficient at 40 yards.
Most sporting good stores have turkey patterning targets, but I make my own and copy them at Kinko's.
You can kill a lot of turkeys with a 12 ga. that you can't kill with a 20 ga.
It's all a matter of how responsible you are about the ranges you're going to shoot at. I like my turkeys right at 30 yards, but it doesn't always work that way. 35 yards is my limit, although my gun shoots a good pattern at 40.
I did this google search and got lots of info on patterning for turkeys:
http://www.google.com/search?hl=en&q=patterning+shotguns+for+turkeys
When I started hunting turkeys in 1968 all we had was 12 ga. 2 3/4 inch chambers and full choke factory barrels. They work just fine with the right shells and the right ranges.
This year I'm going back to using my ol' single barrel 12 ga. with a hammer and 2 3/4 inch shells, just for old times sake.
