I was going to write a long explination of what I did, but I didn't want to bore anyone. I shot at 630 yards in what I thought was a 2 mph 90 degree wind. Elevation was good, groups were good at between 3.5 and 8 inches - well, the one group was good and the others were able to let me know that wind was messing me up pretty bad. ONe group was tight but drifted as if there was a 10 mph wind. The other two were not as tight but they were drifting as if there was about a 5-6 mph wind. The bullet path took it through a vally and about 40 feet in the air before it hit the target so I think the wind patters are very different at 40 feet compared to at ground level. After that I shot at 895 yards and that group was 12 inches - I was glad that I hit paper after dealing with the wind. I was shooting at 45 degrees to the wind, but still through the same valley. I adjusted for a 6mph wind and 45 degrees to give me 2.5 MOA adjustment. This group was almost centered on the target, one 8 inches left, one 2 inches left , and one 4 inches to the right. Elevation was good considering I thought I was shooting at 880 and after I redid my ranging I realized I was about 895 to 900 (accounting for hitting 8 inces low). The verticle spread was only about 2.5 inches so I'm fairly confident that the wind was playing a role. wow, guess that ended up being a longer explination. so, how do you guys judge the wind - I know the wind was only about 2-3 mph on ground, but apparently the average wind the bullet went through over the valley was about 5-6 mph - more than enough to cause a bad wound. and I am fairly confident that my scope adjustments are accurate - Nikon Monarch 5.5-16.5 ao. The virtical adjustments are proven. Thanks!!