At my regular range, a display case hangs on the wall. Mounted in that display case are two big Smith N-frames and a bull-strong Ruger single-action. These revolvers are in very sad shape, with bowed and broken topstraps, and cylinders that are missing big chunks of steel. An overpressure event can happen in any gun. I've never asked about these particular revolvers, but I can imagine something along the lines of "well, I was loading my usual charge of Unique, but I forgot I had Bullseye in the powder measure", or "I had a bullet stuck in the barrel so I decided just to shoot it out". Be careful out there!