I came to a stand still on my 30-378 because of wind so I changed my dies and started to resize my .204 brass. After doing a box of 20 I noticed about every third one or so had wrinkles on the shoulders. I don't think that it ruined the brass, but from what I've read if the case has to expand during the firing process, it could effect accuracy. Not very handy when trying to find proper load so I'll save these for hunting brass after I dial the gun in. Could there be something wrong with the die or did I set it up wrong? I ran the press all the way up and seated the die plus one quarter turn like I did with the .308. Any thoughts? Thanks Larry