I was just about to pull the trigger (no pun intended) on a VX-III 4.5-14X40mm AO with VH recticle ($500) when I found out that a friend of a friend is cash strapped and selling a brand new Mark 4 LR/T 4.5-14X40mm with mil dot for $575. I know they are pretty much the same glass, the VX-III is lighter but the Mark 4 for has more adjustment (30 mm tube) and target turrets (don't yet understand the benefit of them). I will be putting them on a Rem 700 in 300 wsm, shooting a 180gr Accubond for big game out to 600, maybe 750, yards. Any input? How hard is it to learn to use mil dots correctly? Do those huge turrets snag on things easily?