I'm still not getting it. Nothing matches up with the website that GrouseSetter gave me http://www.biggameinfo.com/BalCalc.aspx Thanks it was fun to play with though. I plugged all the numbers in I could come up with but it doesn't match what I have. The only thing I haven't done is Chronigraphed it beacuse i don't know anyone who has one. The info I used is: .223 Cal., I'm about 4" high at 100 yds, 5.5" low at 300 yds. I'm guessing zero wil be somewhere around 200 yds, B.C. is .253 amd sectional density is .149, elevation 3700, temp 10 degrees, fps 3250 (According to the local reloading co.), bullet weight is 52 gr hp. It says I should be 1.3" high at 100 yds and 6.7" low at 300 yds. Something has got to be going on there? Can someone help me out?