Just bought and finished sighting in a Mossberg turkey 500 thumbhole. Used 3" and 31/2" Kent and Nitros. Both shot great at 25 yrds. and 30 yrds. 35 yrds still good but 40 yrds. things changed fast. 70% loss of hits in kill zone and pattern was centered. I used the choke that came with the gun. Guess I would need hevi if I want to shoot farther. Or just become a better caller?