You can't go wrong with a double and the choice of two chokes instantly. You didn't mention if you use a dog or not. If no dog than a 12ga mod/imp would probably be a good choice. My best companion on a bird hunt is one of my German Shorthairs. I have used a 20ga Winchester choked skeet/skeet with #71/2 in the first barrel and #6 for a follow up for years. If I have a shot over 20yds it's rare. Sometimes I'll take the 28!