This will be mounted on a 6.5 Grendel,19.5" barrel, I'm not sure which one to get LV or MV, I know nothing about this round, it looks to me that its right in the middle of the too, any info will help. I plan to use this rifle to hunt and shoot F class, so I'm looking at the 3.5x15 also with either NP-R2 or NP-1 So lets hear some advice