I'm trying to process a bunch of 5.56 brass, all have crimps. I'm using a Dillon 550 with the decapper in slot 1 and Dillon trimmer in slot 3. I was doing good for awhile but now I keep breaking the decapping pin. I broke 3 last night alone with a brand new Lee die. I have tried using the lightest tension on the tension nut that retains the decapper and go slow but no avail. Some brass won't initially line up, but a quick spin of the brass normally fixes the issue. If the pull of the handle seems like too much pressure, I will take the brass out of slot 1 and proceed after sizing the brass in slot 3. I have taken apart the shell plate and cleaned it thoroughly. I'm out of ideas other than decapping as a separate process, but that would be too time consuming.
This seems simple enough on paper and I've never had his much trouble before, but I've also never processed this much brass at one time. Any tips would be appreciated. Thanks in advance.