I have a Nikon Buckmaster 3-9x40 with a BDC reticle on my Savage .270 I will say that I have only shot out to 200 yards, but the circle under the crosshair is supposed to be 200 yards and it is about .5 inch low. I didn't have enough time to go back to 300 so that will have to wait til next time, but I do think they work.