i use to shoot small bore shil and partner with one of the top shooters in the nation!
he mounted a scope to a 4x4 stuck in the ground, and mount a ram target to a board at 100 yards . He checked it on the hour starting at day break. The dot moved through out the day at one point rose above the target then can back down, It made a figure 8! The test in my option was incomplete, it need to be done facing the 4 points of the compass and through the 4 seasons. its got to be the angle of the light and some mirage latter in the day.
I used that data to dial 1 moa up at the end of the day! it was a sudden death shoot off at the southern nationals as the light was diving! Rams at a 100 yards I hit center my opponent missed! I won the class
