swifty52: I gave up on wind flags and wind vanes LONG ago for my load development!
IF... the wind is blowing then you are "guessing" at what the load you are trying to "develop" is capable of!
PERIOD!
The wind is so often more finicky and bubbly than any wind flag or wind vane can relay to you reliably and quickly.
If shooting while doing load development in windy conditions meets YOUR standards then make yourself happy.
I prefer to do my load development in windless conditions - it has worked well for me for decades now!
Hold into the wind (once load development is done)
VarmintGuy
