That was the only one out of the box that did that. I'm not really concerned, just more curious. I don't normally buy PMC but i needed a box to plink with and the local walmart didn't even carry 7mm-08, so i had to go to the local sporting goods store to pick up that box. I was lucky that was the last box he had.
I have heard of varmint bullets doing this if they hit a blade of grass but nothing in this big of a caliber. I have to agree with you Mitchell. Probably just a bad bullet.