Not as a rule. Most of the time, a "nice deep dent" doesn't indicate a hard primer cup, more likely a bad batch of primers. I would contact PMC with the box in hand so they can get the lot codes off of it. I would be pretty certain that if they did have a bad batch of primers that they probably already know, or at least suspect it. Anytime I've ever had problems from factory ammo, the manufacturer is really good about replacements or refunds, although I've never had a problem to contact PMC about.
Did the firing pin pierce any of the primer cups, leaving a hole in the fired ammo, no matter how small? Hard primer cups are usually found in military ammo, mostly stuff intended for automatic weapons, though different manufacturers have different specs for the hardness of their primer cups, Winchester being notorious for having soft primers, for example.
Hope this helps, some, and it would be nice if you post here after you follow up with PMC, as I'm sure many would be interested in the outcome.