Just download Strelok for free. Shoot to max range, and everything in between, and make a chart. If you know your MV, BC, Brrl tw. etc go to JBM and input your data, and print you a dope chart, and tape it on your stick. But seriously it's "Ballistic", "stare" and "wear" glasses. Or just order a BT Kestrel, get Shooter, and read Applied Ballistics, and anything from Brian Litz you can. You could write your own books, just by reading through the sticky's on here. Search, search, search. That's like what's the best stock, or optic question. We all use what works for each of us, and you'll find one that works for you. I don't own a rifle without a dope chart, for each pill it shoots, and the wind.... Well shoot shoot, and then shoot some more. After a cpl barrels burned up, you'll have a real good idea.