I sighted my Omega in at 1800ft. elevation and 78 degrees. I shot at 7000ft. elevation and 35 degrees and my point of impact changed from 2 inches high at 50 yards to 12 inches high at 50 yards. This was with 90gr. of Black Mag'3 and a 375gr. SSB. From now on I will make final adjustments at hunting altitude and temperature if possible. I had similar but not quite as dramatic results with my NEF which was shooting the same load. Only changed aboutfour inches. My synthetic stock Omega has a barrel stock contact problem that I have not fixed as yet. It sometimes does not retain complete barrel float. (I know, I know "fix it you dummy").