Re: Canting the rifle
A simple formula is the sine of the degree of cant * drop at desired range from boreline. Drop from boreline is NOT corrected for your zero.
An example would be a drop of 273" at 877 yards.
The sine of the degree 1 = .02
Take .02 * 273" and you have 5.46". This is how much horizontal displacement you will have at 877 yards with a 1 degree cant.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, 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.