Hi guys, I've been reloading for several years now and have used standard RCBS sizing and seating dies. I have always just set them up (adjusted the body jam nut) according to the instructions and just went with it, never had any problems or accuracy issues. My question is can I adjust the large jam nut on the sizing die base to allow me to bump the shoulder .002 and neck size rather than completely sizing the brass? Also, what tool will I need to measure the shoulder to monitor my progress? This is 300RUM N/C brass and 210VLD's.