If I remember right, 2 MPH full value wind deflects a 180 grain 308 bullet over 2 feet. Remember that competitive shooters have scopes to read mirage and wind flags.

Getting pretty close to a stationary target that's big enough to see at 1250 yards is a lot different than hitting it. The human eye is capable os seeing about 1 minute of angle or a 1' dot at 100 yards. that equates to a 12.5" dot at 1250 yards. I don't think the naked eye can see a crow at that distance.

Most "1000 yard" shots are less than 500 yards. If you've ever stood on a 1000 yard line, the 4 foot bull on the target looks like a period on your front site. My sight was .072 and the bull was not as wide as the sight.

Dick Jones