Mil reticle, Mil turrets, turrets are optional, the reticle is not.
Vortex Viper are some options in that price range. Learning the reticle and the holds to 400 yards is not that difficult. The wind does become a factor at 300 yards and beyond. Using the reticle only is the hardest method, since you are holding elevation and wind simultaneously, but 400 yards and in it is not very tough to get good at.
800 Yard Steel Rifle Range
Long Range Shooting Instruction
Memberships and Classes Available