I have a couple m/f guns, and shoot spreaders in the right barrel most of the time. Personally, I prefer ic/f chokes for everything but skeet, when I prefer no choke at all. Even when waterfowling, I like to get them in close, and ic is about perfect out to 30 yds. Modified chokes in early American guns shoot more like full chokes with modern ammo and plastic wads, which I do find to be a handicap on close shots on fast flushing birds like huns and quail.