Once I trued my data to 1000 yards, the "arc" it predicts worked fine for me at distances from 200-1000. 308, i4320 43.5 grns, 178 gr Amax, 26" 1:10 criterion barrel, 700 action. I used the truing functions and once I did that, I found it to work quite well. The parts I trued were drops in...