Was there a squib before this round leaving a bullet in the barrel? The pressure reached into the barrel because the way the barrel is separated from the frame, unless the frame is just bent away from the barrel. I'm also surprised that the chamber didn't blow out and that could be due to a squib, too. To me, it's not likely that a factory round could be loaded that high due to case volume unless it was a fast powder, which I doubt. I think it more likely that that a primer popped but didn't burn the powder good enough to get the bullet out of the barrel.

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