Ok so I have read about the bobblehead technique to confirm your scopes parallax marks. I am using a Bushnell Forge 2.5-15x50. My at home range allows me to shoot 100, 200, ~300 (290 I believe) and 600 yards due to a rolling hill which gets in the way of the other distances. So I cannot shoot distances in between 300-600 yards. I did bobble head at my 100, 200 and 300 settings on my scope and they appear to be very close to their settings. My scope has 25, 50, 100, 200, 300, 400, 500 and infinity marks. Well this is where it gets weird, when I went to 600 I used the infinity mark and did the bobble head and the crosshairs moved a LOT so I started backing down the parallax while bobbling and for some reason the least movement (almost none) occurred between the 200 and 300 marks. What is up? I hope I explained that right.