Well, I brought two guns and when we got up there it was so windy, I decided to go with the 12 gauge! Guys we're saying the birds were gone before they had a chance to shoot because of the wind! Having said that we got 11 out of 12 pheasant and 5 out of 6 chukar!
One thing to remember, whether you are shooting a 10ga or a .410 you are shooting the same size shot at the same velocity with the same amount of inertial force. The BIG difference is the size of the payload. the smaller the gauge the less forgiving the pattern.
I've hunted with a guy that carried a 28ga for several years out in N Dakota on wild birds. Our last hunt, he doubled on a pair of birds and knocked both dead. One thing I noticed was that he was selective on his shots and consequently, had no problems with a 28ga. Depends on the hunter. . . .