After reading the comments by Scott @ Vortex regarding focus and parallax on the Razor Gen ll 4-27, I am a bit confused as to which mount to buy. My 6.5 has a flat 0 MOA pic. rail. I was planning on buying a spuhr one piece mount with 20 or more MOA. What MOA mount will give me an acceptable range from 100 to 1000 yards + without any of the problems as described by Scott? I know some of you use mounts with 30, 40, or more MOA, but some seem to have the problems outlined by Scott. Appreciate any help.