What I do and have had great luck for over a decade with, is I load to max that will fit in my mag, and still at least .01" from the rifleing. I build up a load on that, and then if it doens't work out, I try 2 or 3 differnet depths. Remember, changing your depth, changes your pressures. I have worked up a load and been just fine at max COL. But I tried to load it deep and it caused some major pressure signs.