Only real danger would be that the primer exits case's pocket at a pretty good clip. Some presses let the primers fall though the ram, others use a slotted ram that is suppose to channel them into a horse shoe type "catcher" around the press base.
Some guys say to soak the cases in water or oil, or fire them at the range. I just turn the ram so that the primer slot and the shellholder is away from me (to the right) and deprime very gently. I turn my face away just in case. The primers in my press fall through the ram and into a tube.
As I said, not one has popped yet, but I think it's kindly like pulling a bullet or getitng a case stuck - it's probably going to happen someday.
They make noise thats about all.Loud noise at that,I have got a few in the vacum leaner too.Same deal loud pop.On the 2 or 3 occasions I have had primers go off while decapping ,the primer never flew anywhere.I have also had primers drop into the slot in the ram.They bind inside the press and usually go off when you raise the ram.They make a loud noise and thats about it.It is a bit unnerving though
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