May have really screwed up. Help

I really doubt any damage been done. I'm surprised that action cycled. Did similar stupid - 357 Sig out of 40 - kept the case as a reminder :o
 
Bore Damage??

An under-sized projectile wobbling down a bore won't enhance accuracy. What would save the gun and shooter would be a greatly diminished pressure curve due to little bullet-bore friction which lowers peak temperature and gas cutting, which is going on big time, fore and aft. Glad everyone survived with fingers and eyeballs who inadvertently tried this experiment.
 
Many years ago, I mistakenly fired a 38 Super round(hand loaded to ultra major) in a 45 ACP Model 1911. The round was top one of a magazine full. The round cleared the barrel OK and split the case and blew it out to 45 ACP diameter. I keep the ruined case on my loading bench as a reminder to try not to do stupid things....it works most of the time.

When I go to the range with more than one caliber, I'm much more careful to avoid mixing ammo.
 
Here is a simple way we do it.
I set up 2 or 3 tables, and use each for either the smaller stuff, and the second for larger caliber. Third table is for rifles and shotguns only.
If a 357 revolver is used, then both the 357 AND 38 cal is fine, as the 357 will accept the 38. Keeps us from having any ohhh s### moments.

Thank you,
 
at my shooting range there is a totally destroyed 25-06 in a glass case, it has a plaque on it that says "this is what happens when you shoot a 308win in a 25-06, always check you are shooting the correct ammo in your firearm!" I'm not aware of the condition of the guy that shot that rifle, but from the looks of the gun I'm sure it ruined his day to say the least....
 
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This used to happen frequently at my range when I was an RSO. I'd notice someone having problems with one of the rentals and YEP the person at the counter rented a 40 S&W and sold the user 9MM ammo. The magazine would usually contain the cartridges and the extractor would catch the groove so on occasion one round would go off but the reports sure sounded funny.
To the best of my knowledge no guns were ever permanently damaged in this way.
Jim
 
Saw a range officer shooting .40 S&W out of a .45 1911. It worked, but not well. He slunk away embarrassed when I pointed out the swollen brass to him.
 
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