Charlie, the 185 LRBT was one of the five bullets we were measuring during the process because I use it at 1000 yd. It also went from having a part of the shank below the neck to getting above it. The original chamber had 0.050" freebore and we added approximately 0.050". I think that for all of these longer bullets, that was worthwhile. I also measured the 175 LRBT before and after because it is the shortest and lightest bullet I shoot in the .308. Even after throating there was still plenty of neck engagement there, about half of the neck as I recall (I have all the figures in my notes in the shop for the article).