One thing to consider is eye relief and getting the scope into a comfortable position. This is a bit harder with a magnum length action. I've got a Model 70 375 H&H, and after trying a few scopes, I've found that only a relatively long straight tube scope lets me get the scope far back enough for the right eye position, while using a two-piece Weaver mount (instead of a one piece rail). With a one piece rail there's a lot more flexibility, but I prefer not to have the receiver partly obstructed by a one piece rail. Lots of people have a one piece rail and they're fine with it, but this is my preference and I'm not alone in that. Also, having to put the scope pretty far back is just what I need for a comfortable, repeatable mount of the rifle. Lots of people use scopes with a front bell at 3-9, 2-10x etc. I've ended up with a VX-5HD 1-5x24. The current model Bushnell Elite 1-4x24 also does the trick and they have even longer eye relief than the VX-5HD. Anyway, if you're more in the normal range for required eye position you won't have this problem.