All indications and the picture showed a factory round fired out of battery.
That is a clear indication of a gun design that can fire before lock up.
A little carbon in the chamber or any other reason to stop a round from chambering should never go off---PERIOD, the gun should stop. Does it have a floating pin that rammed forward when the round stopped?
Fair chase suffered a sever injury either from a factory round with a proud primer or a gun failure and I will stick with him 100%.
You can plainly see only half the case is in the chamber.
Fair Chase, I wish the best for you. Don't listen to a few that can't see what is in plain view.