I am not the best shooter and have much to learn but I have been consistently putting my rounds on target out to 800yds, but the actual dope I have collected manually is not even close to what my ballistic calculator is saying. Like when my hold over at 400yds is 2mil and my calculator is saying 2.5, and I have literally spent hours tweaking the numbers in the calculator to make them match my actual dope. I can get it close between 100 and 600yds, but will be way off at 600 and beyond, or I can get it close 600 to 1000yds but way off at 100 to 600yds.