I'm going to be getting a SPS tactical in a few days in .308 and I've noticed the MOA bases and I assume that one will be lower than the other to accomadate the bullet drop. If I'm looking to stay in the 100 to 500 yard range mostly but not exclusively what would be a good recommendation ? I may at some point down the road want to go out further. Thanks PS sorry if this is posted in the wrong place...