Talking MPH crosswinds as ripp mentioned I was watching a good stag (big stag) standing over a bedded hind with her calf lower down the hill face.
He was on a steep angle and I was viewing him across a saddle with a 20- 30-40 knot wind blowing through.
I didn't have a RF with me at the time and wasn't sure enough as to the actual distance for drop and drift.I knew he was well past 300 yards though.

He stood side on for fucking ages safe because I wasn't going to gut shoot him etc.

The next day I went back and ranged from where he stood back to my vantage log..410 yards it was!

30-40 knots....unknown speed but it was howling and the range would have meant a big drift.
No matter what magnum I had in my claw at the time it wasnt enough to persuade me to let fly.

I never saw him again either.