I have been given 150 Norma 6mmBR cases and have attempted to form them into 30 BR. I annealed the cases before using the K&M step up expander tool. After running the expander into the cases, I am getting a bulge just above the neck that I cannot seem to get out. The bulge is such that the cases will not chamber.
Help. Don't want to "spoil" the cases, but need them to be 30BR.