i have also seen this post the last time it flew by. What i dont under stand is how it could happen. If it was a squib then how did it tear the top of off all three chambers. i can see tearing the one on the top and the top strap and every thing looks to clean and shiny. and how did it dislodge the third bullet and it has only a little scratch on it. I have seen double charge rounds and split the cylinder and break the top strap.
__________________ “If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams
If it was real (vs a photo shop image) it wouldn't be a squib burst. Their hallmarks are different. This sort of damage would be more akin to an overload, possibly a Bullseye or similar powder behind a too tight crimped bullet, or even the legendary undercharge detonation (which is never reproducible in a laboratory).