My work buddy and I and all his brood and a few of their friends were out in the desert shooting last year. We were all on line with various firearms; me and my AR, the buddy and his AR, his son's friend with buddys .500 S&W (standing immediately to my right!) all shooting at once. Suddenly my right ear registers a VERY loud concussion, even through my muffs AND plugs! I look over and here stands this 16YO kid with the .500 about 60 degrees to the sky, the top strap is pointing a complete 90-degrees up and THERE IS NO CYLINDER!!! He is frozen in place because he KNOWS someting just FUBAR'ed big time! Me, I stand there wondering why I am still alive while waves of incredulous excitement pass up and down the line. We ascertain if everyone is whole and alive, and there is only one minor injury; a kid down the line has a piece of steel sliver in his upper arm that bleeds a bit then stops.
We conduct a search for the missing pieces of the gun; 1/2 the cylinder is located in the brush about 50 feet away, the other is never found. Several burst casings are found, including one that looks for all in the world as if the bullet just backed out of the case and went away! Needless to say, that event ended the day's fun (not to mention destroying a $1000 gun!)
We talked about why this happened; his only explanation is that one son helped reload some ammo the night before and might have double-charged a case (WW Titegroup was the powder) by accident. It seems logical, and we are just glad all the kids are safe and no one died. Talk about a SPECTACULAR lesson in attention to detail!