watch the video, very helpful.
Use this method. Find hard jam then back off from there. I understand how engineers think. I have worked with them for 35 years. Your overthinking this. Fyi there is increasing evidence that seating out from the lands a good bit more forgiving. What you need is a reference point to work from. Let the rifle tell you what it likes. If your .020 off or .060 off it doesnt matter. What matters is the results on target.