While trying to seat 150 & 160 gr NP's as dummie's and with powder, I noticed I was slightly crushing my case necks. The rifle is a 270 Wby mag, and I'm using fatcory 1 X brass that has been FL sized/trimmed/deburred. Any Ideas???? I measured my expander ball at .277 and .276 (have 2 stems) and tried them both without much dif. Any help would be great.