And, LOL ANOTHER annoying story from the old days
Decades ago, when I was really stupid, I ended up with a cheap over/under .38 special derringer. No idea if it even HAS a brand. "I reasoned" LOL that the barrels were so short that it didn't care how much powder was in there, because it would just eject unburned powder out the front anyhow
So I screwed around until it would chamber a .357. But I'm not quite THAT stupid............
Took the grips off, clamped the thing between a couple of 1x4's and fastened it to an old stump, string, of course, tied to the trigger. Tried it out with a .38. Fine. Put a .357 in there, went around the corner and yanked the string.
Odd, the hammer is still cocked?? IT BLEW THE FIRING PIN out the back and cocked the hammer on the way past!!