@Hunter :
You are pointing, IMO, at one of the very salt of BR.
I just had a hard day at the range last Thursday. First cession still November when I won 3xGold at regional's. Some 30 mph wind gusts, flag's ribbons playing cat tail / pointing up to the sky, condition was changing every second during my 100 yardage.
All the usual doubts surfaced as I was unable to shot consistently. Furthermore I had to zero the scope following a change in bullet/load. So, ... Am I shooting like a goat ? Is the scope broken ? Did I made something bad making that new lot of bullet ? The usual load is not working anymore ? WTF is happening ?
On my own, I am trying to consider an overall condition on the range and I am a Kentucky windage picker. Issue being that some windy/tempest day (with the flags nailed to the ground using 2 or 3 x 6" carpenter's nails, no condition seems to stand further than a 1/2 second.
In the afternoon, 200 yardage, wind was still strong BUT a bit more regular and I began by shooting 2 x 1 hole groups 2" from each other. WTF ? Bullet base/ogive variation ? Nayyyyyy ....
Depending on the wind force on the same direction, same flags position, bullets impacted 2" above and a bit on the right, while just a bit smaller/lower same condition was on axis.
I am shooting that range for a decade by now. Saw that effect 1 time before, only at 200.
Once I understood what was happening, smile went back on my face. The new bullet batch is good !! The scope is not broken !!! The load works. 1 hole group only.
Years ago, I clearly remember I had to shoot the 2 upper targets at 6 o'clock in the tire to punch a 10. No vertical correction needed on the 4 other targets. Incredible. They are just a few inches from each other. That's not logical. But so did it took place during a competition. Very ballthy correction. Lot of stress.
So .... First flag ? Last flag ? Mid Flag ? All the flags ? Depends on the day, depends on the on going condition, for sure depends on your understanding of what is taking place right now in front of you ... BR you know ... Dancing with the wind ... HBR : + dancing with the gun recoil.
I also never been a fan of the "wind flower", that sketch explaining bullet deviation considering wind direction. That is maybe OK for a computer or a US range in the Great Plains with a very regular wind meeting no obstacle, no turbulence. Here we have tiny ranges, with walls, berms, relief around ...
I do not consider myself as a champion neither do I consider I am holding any kind of Truth, but looking back at my 30 year BR shooting, the wind flower never appeared as a shining/divine revelation to me. That's a much more complicated story. Either you get a quick understanding of it, you are up in the results, or you don't understand, you shoot bad all day long trying this or that condition and end the day completely tired and disgusted.
BR ...
Got a friend in his 70's, know him for 30+ years. He his Hall of Fame here. I remember he has a booklet made with every information he collected on each range he had been shooting. Something like a 30+ years experience compilation. At this range, he knows he has to install the flags like this, with that condition look at that flag first, with this other condition look this one, and so on ... A hell of a job he did, and that seems paying considering his results for the last 30 years.