As some of you know by reading the "what are you doing at the loading bench" thread, I've been processing pistol brass for a month or more. Today while sizing 40 S&W cases I encountered one that did not fit the shell holder. I've found this is usually caused by a damaged rim. Not this time. I got to looking and its a 41AE case, head stamped 40 S&W. I don't know how long its been since I've seen a 41AE? Very interesting?