OMG you will send some of these guys in a coronary episode with that kind of talk.I use #6 lead shot with an IC choke all season.
I'm a firm believer that most people have too large of shot. I used to shoot the 3s and 4s and I would miss more often than not. I scaled my shot sizes down (and stopped shooting 3" shells and only shoot 2.75") and the last 4 or 5 years I've shot much better.
Semi auto I usually just run 5's. Double barrel with different chokes 7.5 or 6s first barrel shot 5 in the second barrel. Picked up some Winchester AA diamond grade 7.5 copper plated shells at 1250 fps. I think that will be my go to first shot this year.
You must not prefer bismuth 4s, but still have hundreds of dollars of 5s (which are fine much of the time) that you want to shoot, hoping to either run out of 5s because you've shot so ungodly many pheasants, or that you switch to the 4s early enough in the season that there were really only a couple times up to that point you really wish you'd had them. See the difference now? It's really very simple.SHoot what you are confident in. That is my best advice. and BTW i see no difference between 6 and then 5's or straight 5's or 5's and then 4's. Just depends on the mood I'm in.
I don't even raise my gun if a rooster flushes that far out. My dog (british yellow lab) is trained to stay extremely close to me. Within 20 yards, unless she's on a runner. Then I can't do much other than try to keep up.Some won't take a shot beyond 40 yds.