For strictly waterfowl use a 26” SP10. Crushes sky carp like the hammer of the gods.
For everything else, primarily dove and pheasants the old reliable is a 1950’s Browning lightweight double auto. 27” Mod choked plain barrel with a grey receiver gets the most use but I have a later production Twelvette with a black receiver and a vent rib IC barrel that gets out some too.
