Back about 10 years ago I guided 5 guy's from Louisiana for 3 consecutive years for ducks and geese, a total of 30 hunts. They all used 20 ga. autos with Kent Tungsten 3 inch. These men could out shoot most anyone using any other gauge. I remember time and again being in and out of the field in 1.5 hours with 40 geese and often as many ducks. They killed the geese as dead as any 12 gauge shell would be expected to do.

Don't think the gauge really matters as much as understanding the limitations of the instrument and shells you are using. Far too many do not take the time or have the inclination to really understand what they have in their hands and what it can and can not do.

Nothing is foolproof to a sufficiently talented fool.