Same happened to me, 4" 625 Jerry M PC gun. The situation was the same as Carmoney. Bang Bang Bang Click click click. Thought the same as Carmoney, Broken hand.
Well the match I was shooting was a winter match at The Smith&Wesson Acadomy in Spingfield, Ma.
Well, I hunted down the armeror and he gave me a new 625 to finish the match with. He Said
I will have a look, come see me at the end of the match. No more than 45 minutes later, he finds me and gives me my 625 back and says all set. He fixed my gun which was a worn cylinder stop. How much do I owe, He says have a nice day and enjoy the match.
Talk about being in the right place at the right time.