While load testing for my new ar,I resized and primed a bunch of brass,only to find out later that I hadn't set the shoulder back far enough.No problem,thought I......I'll just take the decapper out of the size die and set the shoulder back a little.Well I'm sure many are shaking their heads right now because you know what happened next,...the case mouth got shrunk also but didn't get expanded.So now my question is,how do I fix this other than snapping all those primers and starting over,or can it be fixed without collapsing the shoulder upon die entry because of the small neck?