I currently have the MK4 fitted on my 6.5 Grendel and its great if your going to be shooting under 500 meters. Great clarity, tracking, durability ect. I find shooting out past that, scopes in the 2nd Focal just arent up to snuff. I have the S&B PM II fitted on my 338LM in the 1st focal plane. My buddy has the NF SHV and hands down, S&B takes the cake. Botttom line, if you can afford the hefty price tag of the S&B, well worth the dough !!