There has been a terrific amount of time spent on this topic. From an academic perspective, most of the suggestions have merit. From a practical perspective, I'll offer a bit different response. The importance of scope alignment is in direct relation to the size and distance of target. I'll suggest the following exercise. Next time at the range, set up your rifle with an intentional amount of cant. Not extreme, just enough to simulate a reasonable error in alignment. I believe that you will find, it is something on which it isn't worth spending a lot of time. If not, your need for precision is much greater than mine.
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