I was reloading some 45's today and ran across a problem I have never seen before and was wondering if anyone else could tell me about it. Some of the brass takes small pistol primers instead of the large ones. The brass I am talking about is headstamped Winchester NT 45 ACP +P. I have never seen this before. I did load seven cases with small pistol primers and they fired okay w/ no problems. Any ideas why the brass was made like this?