I have recently been looking at purchasing a new scope for my Rem 700 .300 win mag. Specifically, I have been looking into the Vortex Viper PST and Razor HD. One thing I noticed is that you can get it with 5 mils per revolution or 10 mils per revoultion in the adjustment turret. What is the reasoning for this? Any advantage or disadvantages? The 5 mils per rev turret lookis like it would be easier to count and see your 1/10 mils because it seems more spread out with more space between each 1/10 mil line. Thanks.