Home Forums Hunting & Shooting Long Range Hunting effect of altitude in trajectory

If I sight my scope at 3000ft for a 250yd zero and climb to 12,000ft what will be my new zero?

Then, if at 12,00ft I readjust for the original 250yd zero, what will my new drop at 550yds be, given that the 250yd zero at 3,000ft gave me a 47" drop?

Load is 7mm Hunting VLD at 2,780fps.

Thank you for your help.

Alvaro