One thing about using a standard Full choke, or even a standard Extra Full choke, is that they throw a nice even hunting pattern at 25-30 Yards, which is where a lot of shots take place, and they also give you a more forgiving pattern on close up 15-20 Yard shots. The trade off is that they don't give you anywhere near the pattern density at 40 Yards, which can be achieved with a good Turkey choke. However, Hevi13 #7's have so many pellets, and Hevi13 patterns so tightly to begin with, that you could get by with a standard Full choke out to 40 Yards. You can easily optimize a rig for either close or long range shots with Hevi13.
