We are keenly aware of that, however 5's are our prefered size for pheasants and I'm sure you will agree that a 28 will not pattern as efficiently with 5's as a 20 will, also I have never been able to show a meaningful pattern improvement with 1 ounce 28 loads over 3/4ounce loads.
A 28 is the perfect Chukar gun.
I think we're well into the gray area here.
I only hunt wild birds, and we have lots of them not too far from here so you'd go broke running a put and take operation around here.
This early in the year, I have an ounce of #7's on deck, followed by 1 1/8 of #6. Once the birds start getting a bit spookier, that will change to 1 oz of 6 and 1 1/8 oz of 5. Or 1 1/8 with 1 1/4. Where the birds get really crazy, the far end of the scale is 1 1/4 oz of 4's, followed by 1 3/8 oz of 4's. It usually doesn't get quite that bad, however. But there's a variety of shotshells in the truck back in the dog box for whatever we run into.
I would not want to bet somebody a well choked 28 would not deliver just as nice a pattern with #5s as a 20 gauge will. I am well aware that theory has it that the bigger the bore, in general, the easier to get the desired pattern. Along with the shorter the shot column, the more pellets arrive at the right place at the right time. However, I have hunted with too many guys who knock pheasants out of the air with almost boringly predictable certainty using a 28 gauge to not believe they must be getting pretty damned good patterns with their shotguns to be knocking cocks down with such consistency. If their patterns were that spotty, we would see far more crippled birds and lost birds from these guys. Most of their birds are obviously dead in the air. They're the ones, incidentally, who changed my thinking on the effectiveness of 28 gauges versus pheasants, where I once believed the 28 gauge to be the tool of the specialist.
If I really felt an impulse to get sticky with my client's guns, I wouldn't look at the size of the hole in the barrel of whatever they brought. I'd have them take a few shots at a patterning board. And then I bet I'd be just as equally unhappy with some shooting 12's as some shooting 28's.
To my mind, for pheasants, the limiting factor on the 28 gauge is the range, and that's assuming the shooter patterned it, just as the shooter should pattern his shotgun no matter what gauge it is. No matter what barrel the shot comes out of, there are only so many pellets of a given size in an ounce, and there's a range where that pattern simply gets too thin and/or not enough retained energy. For me, once the shots start getting out to 30 yards and beyond, then it is time to go to bigger payloads of bigger pellets. And even then, I have no doubt there are some fine 28 gauge snipers out there who could make head/neck shots on flushing pheasants with a tightly choked 28. I just ain't one of them and never will be.
One thing that probably helps out the 28 gauge is that it is seldom the first shotgun a novice gunner buys. Most guys who end up with a 28 are generally fairly respectable wingshots who do a lot of shooting to begin with. That helps a lot, in my mind.