I am serious about the first round of bird shot. I spend a lot of time in the woods, mostly scouting for deer, and my trap line. A also, carry a concealed weapon 24/7. Rather than carry my 9mm handgun and a shotgun, I just carry the 1911, (as a .45) with one #9 bird shot in the chamber; a magazine of self defense rounds in the grip, and a spare mag loaded with the bird shot, just in case. If my primary motivation, was bird hunting, it would be a stupid practice, but to take an incidental grouse, while scouting, it is just the ticket.
Sometimes I wish it were just a little more convenient to swap back to that .22 for squirrels too. Oh, well, you can't have everything.