I have a feeling you know the answer to all these questions and you're trying to tease our brains. Well, it's working. I still want to know why scope height affects ballistic calculations and MPBR...if you know please tell.

As for this question....I don't know anything, but I would guess that at higher elevations, the POI would not be the same, and the reason for this would be a combination of all the things you listed. MV might stay the same, but Less gravity would reduce drop. Thinner air would reduce drag, thus increasing velocity. Cooler temps would reduce pressure, thus affecting MV...and the list probably goes on. Thanks for the brain exercise, and if you really do know the answer to this and the scope height question, please let me know...

Thanks,
Rob