I'm no expert ,not by a longshot and could very well be totally off base ,I'm just thinking out loud ...but that was no regular load or firing of a regular load ,that chamber metal would not have stretched like that , escaping gas is going to take the path of least resistance ,ie: a "cardboard" tube on a firework is loaded up with blackpowder ,but don't blow up ,it shoots out the open less resisted end ....a close examination of the case head if you have it may give a clue ...in my opinion the "crack " may have well saved you from more serious injury,it seems to have directed the blow upwards.
Very odd place for a crack too ?.
My guess is an obstruction,or overload .
I'm glad you escaped unscathed...sad about your gun though
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