I've guided on preserves and wild birds. I've seen pen raised birds go down w/ 50 yd shots w/ target loads. I've seen wild birds take 4 shot 12 gauges from 20 yds & keep going.

There's no comparison. Pen-raised birds = lightest load you are comfortable with. Wild birds = 6 shot early in the year & go a shot heavier every 3 weeks into the season. They get smart very fast.