I am loading Barnes TTSX 130gr .270 WSM. I have measured 0.050" off the lands of my rifle as suggested. This puts the tip of the neck in the middle of the first of the three cannelures on the bullet. In the past I have only crimped onto the main body of the various bullets I have used on a .308. I use the Lee factory crimp dies. What technique does one use to crimp into the cannelures on these bullets. The groves are quite wide and deep compared to Hornaday Interlock/SST for example. It feels strange crimping into such a wide groove.