Ok, for me its all about a clear site picture without any neck & shoulder straining.
Like any other position set up, close the eyes get down behind the rifle, open your eyes and see where your sight picture is and adjust the LOP accordingly until you can do this without having to re-adjust your position top get the scope or front rear site alignment to where you like it.
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Experts my chip in with a more detailed explanation of what they do.
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