I thought the same thing to. You got fully loaded stations, the bottom of case to the point where the seating stem hits the bullet should be the same or within a few thou. I guess all the little variables add up. Brass not same size, different bullet oal, case wall thickness, the way you pull the handle, all I know is it used to drive me nuts, so I did the sort thing and it made a huge difference especially with precision delta 124 Jhp’s. I sorted for awhile but what pita, really not needed for this game, plus I shoot a Glock so I don’t do it anymore.