I'd say take your time my man, and get the scope that you want for the rifle. My son and I threw the Nightforce NXS off of my AR10 SASS onto the MRAD over the holidays just so we could go and "try" and shoot it. I should have just thrown my wallet down range. It would have made the same difference. Didn't get any satisfaction, PLUS, now I'll have to re-zero the damn thing back on the SASS. That'll teach me to keep it in my pants until I can get the proper hardware next time.
Oh, and we were using some Hornady 285 grain. They extracted just fine and the brass still looks in great condition.