Re: Case exploded today !!
GET A LAWYER.
I had a similar experience shooting some Winchester white-box .22-250 ammo from a Ruger M77MkII VT a few years ago... one round fine, next round ka-boom, and the mag floor plate blew out, my ears were ringing, and I ended up picking a fair amount of primer cup out of my face and thumb right where they sat on the stock behind the bolt - I was not impressed with the gas containment of the M77. Bolt had to be opened w/ a deadblow hammer, and the case pried out of the bolt face. The case head wasn't split lik yours, but otherwise the primer 'hole' (not much of a 'pocket' left) looked about the same.
Ruger's head of 'tech support' flat out accused me of blowing it up with hot handloads. They 'offered' me a new replacement rifle - at dealer cost. Nothing wrong with the one I sent in for inspection (no deformation of the bolt face like yours) - despite it being able to close on a Wilson NO-GO gauge (oh, but our 'factory-calibrated' head space gauges say its just fine) and damn near closed on a FIELD gauge. They said if I truly had used factory ammo, then call that factory about it. Like an idiot, I sent in the remainder of the box of ammo. Of *course* Winchester said "Nope, nothing wrong w/ the ammo... here's a gift certificate for a new box of 20rds of ammo. Have a nice day". Basically one bigfinger pointing party, with me stuck in the middle with no recourse but to give 'em both the finger. I didn't document anything, no witnesses on the firing line, nothing...
I'm not normally the lawsuit-happy type... but I'll say it again...
GET A LAWYER!!!