I wanted to use the false shoulder method to help with consistency of length of the fire formed cases. In this article http://www.6mmbr.com/260AIforming.html Chris Long says he had no more than .001" length variation after fire forming. Years back when I had a 338-06AI I had maybe 4-5% that moved with the primer strike and formed a little short. No big deal for cheap 30-06 brass but these days with Lapua being a buck a pop and the scarcity of components in my neck of the woods I thought about giving his way a try.