Rifled and smooth bore shot barrels
For many years european shotgun manufacturers have produced what were called canon barrelled doubles, with one barrel having a very slow twist rifling system for use in dense cover, to rapidly open shot patterns at 15/20 meters, they work well, many times better than my own reflexes, they are ideally designed to work with felt wads, as plastic wads hold the shot together to well, and I have on occasions, hit the bird with the plastic wad, which don't make for a pretty kill.regards Bully