I like mod/ full or full/full but as s davis said, 4s don't pattern that great from a 16, at least from my guns. My buddy has shot nothing but IC his whole life. He says anything else plays with his brain. I've messed with chokes and shot sizes more than most and It's been my experiences that it doesn't matter what choke you shoot, sometime during the day it will be the wrong one! Most guys would be better off with sticking to mod. and getting good at judging where your range is. When the gun hits your shoulder, you should have one of three thoughts. Killable, Iffy, too far. When I take the shot that I know is to far, I always have another thought. I'm a dumbass!