Many years ago I acquired primer pocket swaging tools for both large and small primer pockets. I was using a lot of military surplus ammo and brass at the time so these were very handy for dealing with the crimped-in primers.
Over the years I have found several lots of brass with unusually tight primer pockets, and the swaging tool remains handy from time to time.
As SMSgt mentioned above, I have punched right through a number of primers with the decapping pin, and I have also experienced off-center flash holes that will break the pins. I always keep extra pins on hand.
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