Well here in Pa the largest shot size allowed for predators isBB lead, BB bismuth-tin and T steel, I don't know about coyotes with it but I just got some Remington SP BBx2 Duplex shells I have used #2's 2 3/4 for a long time but these seem to expand my long shots about another 20 yrds give or take. I can say that for those who want to try the hevi shot please do, and Personally I can say I didn't worry about a different choke tube, I use the 3" mag #1 and BB for ducks and the 3 1/2 T shot for geese and I think its safe to say that this yr I probably shot more at ducks with that stuff than most people would fire in a couple yrs at predators ( and if i'm wrong I wanna come hunt with you) and have had no problems with gun, chokes, or pattern I am mostly using the factory Benneli mod tube.