So.....Im looking to buy a new optic for some double duty action. I need an scope that can function on both my BCM ar15 AND my Remington 700 chambered in 7mm rem mag for some distance shooting out to 500 yards or so. I'm interested in either the Vortex Viper or the Vortex Diamondback (killer warranty). I realize there may be a need for 2 sets of scope mounts in order to fit the two rifles but that's not an issue for me. Which model and configuration do you think is best for my application? Thanks!