Here is the problem: Actual drops recorded are as follows. 1200 yards 8.3 mils 1057 yards 6.4 mils 496 yards 1.6 mils I must enter numbers like MV 3380 and a BC of .8 with A DK of .445 for a ballistic program to agree with the actual drops. I have tried this three times and the results are the same. I verify my zero (100 yards) dial 8.3 mills for 1200 yards and get a direct hit dial 6.4 mills for 1057 then dial 1.6 for 496 yards then reconfirm my zero again. Here is the set-up 7mm WSM 27” brux barrel Defiance long action and Nightforce nsx 5.5X22X56 scope mounted 2.7” high. I have checked the velocity with 2 cronos. And am getting 3034FPS @ 72 degrees 29.99” and 60 percent humidity. I’m shooting the Berger 180 hybrid VLD with a BC of .674 according to Bryan Litz’s book. I have calibrated the scope and it's actually .1 mills per click. Why can’t I get my ballistic program to get even close with the above numbers?