Annealing doesn't change the hardness anywhere near the case head.Because of the way the AMP annealer works, it's NOT likely an annealing problem. . . even if it was "over annealed". The AMP heats up the neck and shoulder really hot, really fast and for such a short time that very little of that heat gets down to that part of the case and the brass cools off pretty fast. So, I'd say something else is going on.
 
	








 
 
		 
 
		 
 
		 
 
		
