I began reconditioning a-mess of 45ACP cases, separating small primer pockets from large. Then I came across, the medusa case. I had been putting these in with the small pockets because they looked just like them. All of a sudden I came on a case which had the primer cup bottom still hanging on by a thread. After close inspection, I pulled all the cases back out which had the headstamp "WIN NT". I could see what looked like a collar used when making a Berdan primer pocket into a Boxer pocket. It was not a collar. After I used my super-bifocal glasses, I could see, it was the sides of the primer cup still stuck in the primer pocket. The flaw, when depriming, the cup separates cleanly as if it were cut off. On a few of these cases I could see the irregularity were the primer cup separated. I pulled all these morphadites out to go in the scrap bucket. After doing some searches online, I found 3 different instances from 2007, 2010 & 2011 on loading sites where they thought these "NT" primers stood for non-toxic, no lead. Apparently other headstamps use these, not just WIN. But all have the same problem. People could not get, even small primers to seat in them. I gauged them and found out why. With the sides of the primer cup stuck in the pocket, the hole is to small to fit even a small primer in. I found 2 out of over 50 which did gauge for a tight small primer, but most were not even close, this could be trouble for someone who is able to seat a small primer into the sides of the old cup, maybe? I even reamed them to see if maybe it was some type of military crimp, no way in hell. Everyone who has ever run across these, has tossed them, do to problems trying to fit a small primer back in the case. I also have culled them out and will forever keep an eye out for them. Never to bring them home.