Revolver with a very, very hot handload in a magnum case? Looks as though the explosion in the top chamber has blown into both of the adjacent chambers and set off those rounds too. Must have been quite a bang.
only ever seen that happen in a 1860 Army Colt when all six went at once, but there was a blown chamber S&W on the wall in the old Cardiff Shooting Centre just to act as a reminder to wear your glasses, I bet his hand hurt
I've seen the results of US Army tests from the 1950's showing a 7.62 NATO in a .30 M1.
No explosion, casing fireforms so that it looks more like a .45-70 casing and the bullet hits 3ft low at 200 yds.
This photo has been doing the rounds in internet wahs for about two years, with a variety of stories attached to it (Chinese ammo, faulty cylinder, etc). The consensus is that the firer has double-charged his handloads, and probably with completely the wrong powder as well....
I recall RO ing at Winnans when someone speed firing had a hang fire go of in his Charter arms 44 Special Bulldog. Picked lumps of cylinder out of my chin and neck but no damage. the pratt cacked himself. Poorly stored hand loads meant the primer slowfired and blew the revolver to pieces!
My Sister in Law bought some cheap "Black Widow" .38 Sp ammo and managed to get a bullet stuck in the barrel of her Ruger 357 security six 6" she didn't realize and fired a second round which only just left the case and jammed the cylinder,both rounds only had primers, as did quite a lot of the others in the box, but thank f@ck it didn't blow up but took some time to drift the rounds out of the barrel . we ran a gauge throughit and it was OK
Saw a chamber blow once at my gun club. Fella was shooting a Llama .38 Special revolver and decided to try some +P+ ammo that was new at the time. Chamber blew and the top strap was at 90 degrees from where it should be. His face was peppered with metal bits and shooting specs ruined but his eyes were OK.