My standard turkey gun is an 870 with a 23" barrel and 3 1/2" chamber. When I bought it I thought it would also work as a back up duck gun. It won't. It's balanced so poorly and kicks so badly that it's useless for anything other than turkeys. Even with light 2 3/4" loads the gun jumps, target acquisition is very slow, and the pump stroke is extremely long.
I shoot the tighter full choke that it came with.