Wow now that's scary! I'm sure someone else with more experience will have a better answer but it sure sounds like the firing pin is a little too long or its spring is weak and lets it fly forward too far just from inertia.
After a trigger job my 45ACP went full auto and emptied the magazine, 7 seven shots in a couple seconds sure got my attention!
Hope yours is an easy fix like the 45 was. That's weird that it only happens with hollow points. Can't see how that would matter as far as the primer and firing pin are concerned.
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