There is a nice article by Bill Duncan in the current FS #274. Bill found it necessary to polish his Redding Profile Crimp Die (PCD) to get it to work smoothy. The PCDs I purchased  were not as rough as Bill's, however they would cut a hair thin ring of brass from the case mouth. I cured this by polishing the die with emery compound. Be careful with polishing, enlarging the die will defeat the purpose.

If you are crimping a straight wall case for a carbine or a revolver, you should be using a PCD. See Ed Harris's article in TFS #263 The accuracy improvement is significant, I have proved this to my satisfaction and now own a PCD for every one of my straight wall cases.

Steve Hurst