Well fellas, when i use my rcbs die to expand my 9mm cases, i believe the boolits are getting mushed a bit. After measuring a pulled boolit im seeing around .357 when boolits started at .358. I know ive read about getting a stem for 38sw ?? I cant quite understand this. Can anyone point me in the right direction. The threads on this subject just didnt explain it so i can grasp this idea. Any answers would be greatly appreciated.