Clearly this is not a scientific test in a controlled environment but it is something I study and look at frequently while out there learning.
I had another shot not long ago that showed 6 mph R to L. It was 980 yards, made the adjusment, sent it. POI was left 1 MOA. I discovered the wind at muzzle was close to the ground and not as strong as bullet path. Observing tree top movement and then holding the kestrel
8 feet off ground I noted a 2 mph increase.
Which goes back the quesiton about, a meter or not? For me, absolutely. It is one thing to shoot at rocks and guess. It is another to learn about the elements that affect the bullet, use the tools to educate myself, and take those tools to the field. Even a friend, who is an army sniper, is not accurately calling the wind with less than 1 mph accuracy. He also shoots large calibers with heavy bullets to minimize wind affects and does very well.
When I go the field I have the ability to monitor: wind speed, barometric pressure, altitude, temperature, range, and slope. That means 3 devices go with me at all times: Leica RF, iPod with Shooter, Kestrel. I don't need my GPS for a solution but I take it anyway so I know when I am lost.