I just. Bought a savage 111 LRH 7mm. I'm looking at scopes now and the one I want is a leupold 6.5x20x50mm. I was wondering if I need taller rings to avoid the 50mm end hitting my barrel(with 20moa base)??? Also what kind of ranges does a guy have to be shooting to go to the 20MOA base if he has a 30mm tubed scope???