I'm having a 338 RUM built on a 700 action. My question is I plan on running a nightforce scope, or new HD vortex as I can get a deal on them just not sure what that is yet. Anyways, do I really need base and rings that will cost several hundred dollars like nightforce's one piece? Also do I need a 20 MOA base to shoot to a 1000, maybe little farther? Plan on shooting 250 grain nosler acubonds around 3100 fps +/- Also if I do go with the nightforce base set up do they use bigger screws into the action?