Re: Scope Canting
For spin drift no. Spin drift is a result of air pressure. When a bullet is in mid air the nose points slightly off center in the direction it is rotating. Since most barrels have a right hand twist, the nose of the bullet points slightly right which puts more air pressure against the left side of the bullet than the right forcing it to the right. A bullet's length, stability factor, rpm and time of flight come into play here.
You may be thinking about the coriolis effect. This will also cause objects to appear to deflect. In the northern hemisphere it will always appear to impact right. North, south, east or west makes little to no difference regarding a right hand impact. Since I live in the northern part of the northern hemisphere and I use right hand twist barrels I see between 8-12" of combined SD+CE depending on which caliber and load I'm using. Shooting east versus west, the coriolis effect affects your vertical. North versus south is of no consequence vertically.
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.