I was wondering about that. Yes it is the only brass I have measured with this die. I didn't know if neck thickness could taper and if .003"+ was abnormal or not. This batch is Federal brass if it matters.
Also Mathman, with your method of setting up the die, does the press cam over right at the very end of the stroke?
Cam over or not depends on the press. If you go through my method the cam over won't pop caps off the die or overdo things.
Neck thickness surely can taper. When I've been turning necks and the mouth end isn't touched and the base end is cut all around it makes it plain.
