When it comes to shooting multiple targets i would recommend a semi auto. From a physical standpoint when you "pump" the gun your moving your directional arm and target aquisition time is longer because your doing more work and when you pump it it throws off your smooth motion if your swinging the gun. So if your in a tight situation it takes longer to pump the gun rather than letting the semi do its thing, you may lose your next bird, clay, or what ever your shooting. So when hunting multiple game, go auto. when shooting a single animal or what ever either will do.