What caused what you see in the photo below?

Some background. Rifle is a Savage Hog Hunter in .308. I have 191 rounds thru this gun that I bought brand new in January. About 60 of them steel, and the rest was Freedom Munitions 168 Grain A-max rounds, of which the photo below is of. I’ve had zero problems until I tried chambering this round a couple of days ago. Any thoughts on what might have caused this?