This is my first year usingHeavy-13 shells but manthey patterned good out of my little short barreled Mossberg Tactical Turkey gun with a Jellyhead choke. Maybe not great by Nitro standards but Heavy-13 number 6's will put about 77 pellets in a 10 inch circle at 40 yards with good evenly spread density. That certainly won't win any still target contests but it's pretty darn good for a shotgun with a 20 inch barrel. And no turkey head stands a chance at that distance. The two birds I've shot with it this year didn't even flop.