besides the actual constriction, you might also find that the size shot you use matters a lot, mostly larger shot shoots tighter in a looser choke, this matters mostly for waterfowl but also may affect your turkey pattern. also it is known that the mass, amount of pellets going down the barrel have an effect. that's why 3" shells in a 20 ga. is a poor performer, one answer, check it out or don't complain when you come home making excuses to you queen. the other answer of course is to learn how to hunt and shoot them up close, choke be damned

cheers