Practising yesterday I came across the effect again, it was very subtle, but definitely present.
30 yards & 50 yards, 15mm kill.
Average wind speed of 12mph at 90º to Path of Flight, right to left. (Full Value windage)
I was getting POI movement high and left of approximately 3 to 5mm.
So I thought I had zero shift. Went down to my zero range which is pretty much out the wind running perpendicular to a Devon hedgerow in a ditch. Zero was spot on.
Went back to were I was practising in the wind. Same POI movement.
Now the interesting part, I moved my position so the wind was at 45º to Path of Flight.
(Half Value windage)
No POI shift, spot on.