I have decided to go with the Zeiss Conquest 3-9x40 for my model 70. I already have the two-piece bases from Leupold but I still need to get the rings(leupold). I know the scope should be as close the the barrel as possible so my question is what height should I use? I have researched and found that the medium rings will work, but I want to make sure. Also, I have read that with a larger caliber rifle and/or magnum it is a good idea to tap the factory base mounts to a larger diameter. My model 70 is a 7mm rem. mag., Do you think I should do this as well? Thanks in advance.