Wow. The longer I live, the more I learn. Let's see . . . don't know anything about late season pheasants. Hmmm. Lived in Iowa most of my life, averaged 65 wild roosters per year from 1987-2006 (until Iowa bird numbers crashed). Included plenty of late season birds. One season when winter didn't shut us down early, I bagged 49 from Dec 1- Jan 10 (end of the season). And this Jan, with bird numbers lower than they ever have been in Iowa . . . hunted with one other guy Jan 3, for under 2 hours. Cold, strong wind, not the best weather for surviving roosters to hold. We put up 6 roosters, 2 of which were way out of range. The other 4 . . . all within 25 yards. One ended up folding to a longer shot, but only because my partner didn't kill him with the 1st barrel.
As for not knowing anything about spreaders . . . PA24, you're a real genius for sure. So you shoot nothing more open than mod. Well, yeah you do--if you shoot spreaders through your mod. You're opening the choke without reaming it. Amazing that thought never occurred to you. Choke is most accurately determined by pattern % at 40 yards. Shoot your spreaders at 40 yards, count the holes, then come back here and tell us what choke you were REALLY shooting.