If the barrels were bored something like IMP CYL, MOD then FULL, central, right then left, trigger selection would allow good choke selection.
I must admit 2 Ithaca SxS 20 bore I had was a delight on decoyed ducks and teal. I found skeet loads of 7/8oz. #9's perfect to about 35 yards. No body shots and all heads and necks - bloody deadly with multiples often.
Why do we sell guns we only later cherish?
A 28 bore would have been even better.