I loaded up some 250gn Hornady BTHP match projectiles and chronographed them at 2652 fps. Checked my zero at 100 yards was spot on, then worked out a drop at 1000 yards of 30.75 MOA and at 605 yards of 13.75 MOA. Temp 19C pressure 1000mb. Rifle is a Tikka T3 Laminate with a Clearidge 2.5-12.5x42 Ultra XP5 on 20MOA rail. It is quite an accurate rifle for a light weight hunting rifle. Now at 1000 yards the group was 44cm high and at 605 yards the group was 30cm high. I have played about with the inputs into my ballistic program but can not get thing to line up like they should. I am thinking as the height error seems to be linear from 605 to 1000, that maybe my scope turret adjustments are not quite MOA????? Any ideas?