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If you shoot competition you will learn to inspect the flash holes on new brass carefully. They may be only partially punched through on some with a flap hanging on. And you will clean the pockets every 3rd or 4th loading to make sure that your primers are seated all the way in. If the firing pin has to finish seating a primer and then pop it off you'll get terrible accuracy. Most competition guys use Federal primers and lightened hammer springs, so the primer has to be fully seated to have a chance of igniting it. If there is a ring of crud in the bottom of the pocket you can't get a good consistent seating on the primer. That's been my experience.
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