On my 700P I used the Leupold STD Long Range base and Burris 30mm Signature STD High rings. I mounted a Leupold 6.5-20X50 and had plenty of clearance. Theoretically, this set up allows you to "build" in 40MOA (base 20 + ring inserts 20 = 40).
After zeroing my rifle for 300 yds I sat down one afternoon and counted the up clicks still available and I forget the exact number (237?) but had enough MOA to get to 1525yds.
That might come in handy for some folks but I don't have the range, or a range finder good enough for that yardage. Even if I did, not sure how much HP the 7mmRM has left. YMMV. JohnnyK.