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With my USP(.45ACP), it was locked in battery & stayed that way. Completely locked. You can see where the case blew out, right where it wasn't supported. I won't disclose the name of the company, because 1) They were very professional every step of the way(also replaced my gun) & 2) I'm of the impression that these things could happen to almost any ammo manufacturers.
I also contacted Heckler & Koch, they blamed the ammo manufacturer immediately. Most people I showed it to leaned towards ammo issue, but there were couple who weren't 100%. Ammo company had me return the entire batch back to them(few boxes), especially interested in the very box the particular ammo came in. They tested it, said couldn't find anything wrong with it, but would send me another USP.
Glad your hands are okay(mine were, too). I was seriously scared to shoot again there for while.
Interesting. Did not know that.