Can you guess what caused this failure?

In the 2nd picture I was trying to see what cartridge this rifle was built for. 300 something or other. Was a 325 wsm nearby? Possible mix up of ammo, obstruction, or wrong powder charge.
 
Hope you're OK if you were behind or nearby.
The last photo of one I have seen a few years back was a cleaning rod left in the barrel. The shooter had a stuck case, popped it out, fired another round, and it looked similar to this.
We don't know yet, in this event. Could be literally anything....
 

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