I had a similar situation with a box of 178 BTHP Superformance ammo in .308. Contacted Hornady, sent pictures, and sent the remainder of the box back to be tested. I forget precisely what they said. It was something like they hadn't pinned the primers or something on that lot. Sent two new boxes to me which worked fine, although they didn't group like I wanted.
I have also had some issues with .375 H&H in the past well with Hornady. Had a few rounds have half moons in the necks after firing them. Once again, contacted Hornady about it, sent in the remainder. They analyzed it, informed me that the lot had had some issues with neck tension, and sent new ammo.