Well.. it finally happened... Had 2 primer tubes go boom. more like a loud snap. A case made it to the primer station with the original primer still in. The first time around i just missed it. Didn't really notice any difference in how the press felt when I cycled the handle, but pop.. there she went with primer rod shooting up at the ceiling and leaving me a bit startled...
The first time this happened when I bent my Lee under size die for 9mm the primer punch rod. I didn't have a spare, so I installed the Dillon decapping and sizing die. Was back up and running in no time and about 200 rounds later bang, pop. I blew the entire stack of primers and put a hole in the aluminum inner primer tube. Had to replace the plastic primer follower rod as well since that shot up and hit the ceiling. I replaced all the damaged parts ( the inner small primer tube that is inside the steel safety shield) and cleaned up the burnt primers and primer shuttle. Was back up and running in about 30 minutes. Was reloading again and at about 200 rounds later, another case with the primer still in, got into the primer station and blew the primer tube up again. I was now done.. no more spare parts.. The second time was on me as I kinda of felt something was not right, but was going too fast and pulled the handle even though the voice in my head was telling me something was off.
Not sure if it was a batch of bad luck or had something to do with switching to the Dillon de-cap sizing die. The pops both happened using this die. I had loaded around 20K rounds using either a Hornady or Lee undersize 9mm decap and resizing die and I never had this occur. The Dillon die was set up correctly. I have replaced all the damaged parts and have gone back to my Lee undersize decap resizing die.
Going a bit slower now and looking for the spent primer coming out of the resizing station. I have read that people have sanded or dulled the point of the Dillon decap pin to try and avoid the issue of primers popping back in or not being ejected. The pin on my die looks pretty blunt at the end, so i am not sure if this was the issue or something else.
Anyway, reloading a bit more slowing now...