Re: bullet drop and scope leveling
Dont forget spin drift. While the rotation of the earth with a hand carried rifle is barley noticable spin drift can have a very noticable affect. Esspecially if you have a very fast twist for bullet combo and a long TOF. Even when the crosshairs are perfect and the rifle is not canted you WILL notice spin drift.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.