More than anything I think making sure that your shot is well positioned with your sight is the biggest concern. Some guns shoot better with more constriction...others with less. That is a moot point if the majority or your pattern is not in line with your sights.

I say that the tighter patterns and hot loaded shells are more about distance than humanely harvesting a bird. If that were the case then 20 ga shells would be illegal as they don't have the same hitting power at 40 yards that a 12 ga does. An improved cylinder can be just as effective (if not more so) as some of the high dollar chokes. The difference becomes distance. Don't be afraid to shoot an IC, Full, or Extra Full factory choke. Just make sure you know the limitations of the gun at certain distances, make sure that the bulk of your pattern is hitting where you are aiming, and make sure you can identify proper ranges in the field.

Now I know there will be some disagreement. I know a whole bunch of turkey hunters that have never owned a gun with screw in chokes or if they do they never have bought an after-market choke. These folks are smart hunters that make the shot count and don't take 60 yard shots.

Having said all that I shot a 3.5" shell out of a Benelli SBEII with a Primos JellyHead .660 choke. I have used Nitro, Mag Blend, and Hevi-shot shells but this year switched to Winchester Longbeard XR.