OldElk,

Truth be told, unless you are one of those guys that wants a specific pattern at a specific distance just about any choke tube will do. You will hear a lot of hemming and hawing from folks about this or that. Those are the guys who are trying to hit turkeys way out there like 50-60 yards. If you limit yourself to say 35 yards any tube will do.

As for shot I prefer the 4's. They will hit a bit harder if you push your distance than a 5 or 6 will.

I would pick up a choke tube and pick up a box of 4's, 5's and 6's and see which one produces the most balance prettiest picture.

Have fun.

Tom