well I asked this question in another topics area and it was either such a dumb question or nobody knew so here we go. I have started praire dog shooting. My ideal shooting would be to range a dog and dial up the "dope" to drop it. I have my scope zeroed at 100 and that is where my stop is set. IF I have my BC,S bullet weight and FPS all entered correctly in my ballistics app. my thinking is that I could enter 400 yrd zero, look at impact at 100 and dial in with that info. My app says zeroed at 400 I should be 7.11 inches high at 100. So if I'm zeroed at 100 I could put in 28 clicks and be on at 400?