I just shot the hevi 13(#6's) today and it does pretty darn good, with 17-21 pellets in the brain and spine of a primos turkey target. With Win xtended (#6's) I got 15-18 in the brain and spine and with win 2 1/4 oz. #4's I got 8-13 in the brain and spine. All of these are at 40 yards (used a range finder) and all pellets countedare in the spine and skull. The choke I used is the mossberg xtra full turkey choke.