Not an American perspective, but here in the UK, the typical modern pheasant load is 30grams (approx. 1 1/16 oz) of 6 shot. I use this load in my S/S and O/U until about mid November then switch to 32gram (approx. 1 1/8 oz.) 5s, almost exclusively in my O/U. Seems to work a bit better on the bigger late season birds with slightly thicker plumage, especially as they've usually seen a bit of pressure by this stage and fly better. For a dedicated high bird load somewhere like Devon, 34 or even 36grams isnt unheard of, often in 5 or even 4 shot sizes. Not an issue for me of course as I both can't afford that kind of shooting and the idea of 8:1 shot/kill ratios on 60yd+ birds doesn't sit that well with me really. More power to those who can pull them down cleanly and reliably though. In my old 16 bore hammer gun I use 26grams of 5s exclusively. Works well for me out to 35-40yds.