I've had this happen with a J frame shooting factory magnum loads with lead bullets (not jacketed). The cylinder jammed up (wouldn't rotate), the bullet came out, and there was powder everywhere.
I've also had 2 parts failures (the MIM hammer block broke both times) with a J Frame which kept the gun from firing. The third hammer block was not MIM manufactured.
None of these failures happened in a gun fight.
Joe Mamma
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