Dirtfarmer probably knows it, but his statement above about first focal plane reticles needs to be corrected in that the crosshairs get THICKER, not thinner when you crank the power up on a FFP reticle.
FFP does neither. FFP reticles cover up the same amount of target at all powers. If the reticle covers up 1/2in at 100 yards at 6x it will cover 1/2in at 18x.
