This definitely looks like an out of battery condition. Note where the major deformation radiates, the breech, and that fact that the exploded brass is split so far from the chamber. The case head detached AFTER the primer strike, so the only way I can see for that case to split that far from the barrel is if it was not actually IN the chamber area, thus no support for the case. This is a pretty strong case for manufacturers taking steps to ensure their weapons cannot fire while out of battery.
Now, if you had a gun that did not allow the round to completely chamber and would still fire it, one should imagine that the reason for the battery condition would be insignificant to the fact that the pistol DID fire with the out of battery situation in place, thus what the ammo was, where it came from, or even if it was the right caliber (!) is moot, the gun should not have FIRED to begin with!! I am no attorney, but it would seem that some compensation should be in order even if you had NOT been using factory ammo when the pistol kaboomed. You need a good attorney and you need to retain this pistol AND all the photos! As others stated, let their engineers come to YOU, the potential savings of their future customers should be worth them making the trip. The gun is the issue (should not have fired) not the ammo.
I suppose it is possible that the slide did not lock forward, but that is still a pistol issue, not an ammunition issue. Still, the pistol failed, imo...