i have one in my spst supermag i have just tried it a couple times.i shot a win supreme 3.5 with 2.25 ou of #5s and a rem #6 in 3.5 with 2.25 ou at 55 yards i got 65 pellots in a 16 in square box.i havent got around to trying my hevi shot yet all i have tried was lead.but i did notice a noticeable amount that the choke remover the recoil,it dont jump like it used to.i hope this helps you.