Thanks JPro and Efw, making a dummy, I kept seating till the tip was about
an 1/8 th or 3/16 th shy of touching the forward part of floor plate mag box.

With this 140 gr bt , the base of the boat tail is in line with beginning of the shoulder , before it tapers.

This gives me a 0.092" jump to the lands.

Last edited by WHITETAILTHUMPER; 10/28/16.