I need to purchase a scope for a new .270 hunting rifle that I just built. Shots will be taken out to 600yds most likely. Im trying to keep the gun lite as possible. What is everyones opinion between the Vortex Viper PST 2.5-10x32 FFP vs the newer Nightforce NXS Compact 2.5-10x32? Other than one being FFP, they are both pretty similar. Any comments?