A couple years ago I was playing at 600 yards with my 6br. Shooting out of my garage . I shot a group and drove down to check it out. It was about where I expected with the 5 mph cross wind. Looked at my wind sock to shoot another group and kinda scratched my head a little and shot.
I shot the group and went to check. Sure enough in 5 minutes time the wind had switched 90 degrees. Strange stuff happens here in ND. Edk