I only mentioned the bulged cases to note that I am not talking about that issue. Rather, I am talking about the case tension holding the bullet. In my case, that bullet will be a .001" over sized but well lubed bullet. I was thinking that maybe the U die would help that tiny bit more in holding the bullet. If it means that I'm that much safer with a heavy .40SW bullet then I am willing to try one. But I have no idea if bullet setback is even an issue. While I have not heard of it, that doesn't mean it doesn't happen. I didn't know they made a three inch Model 19 until a short while back... These things happen. But I seem to have derailed my own thread right from the get go since all this has been about sizing the case from a "Glocked brass" standpoint. I just want to know if the extra neck tension would be a good thing or if it's just fluff.