With the right LOP and proper cast off your riffle should shoulder with your eyes closed and when you then open your eyes the sights should be lined up, for me wearing just a shirt, one layer of clothing the LOP needs to be 15 inches.if its more than one layer, winter jacket, etc., then 14 7/8 to 14 3/4 is good.
I was fortunate to have gotten to know a custom builder who took the time to teach me how to measure my lop and understand what I would need as far as drop, cast on, cast off, etc.