what caused this?

I picked up an odd 9mm case at the range this morning. I'm assuming this round was fired out of battery, but why is the front bulged? In any case, I'm thinking this fellow was lucky.

Cliff

 

No, the round was fired "in battery", just in a 40S&W barrel.

If you measure the enlarged case neck, it will be close to 0.40"

 

Looks like a 9mm fired in a 40.

 

Shot in a 40.

 

Ahh it’s a crop circle. Somebody put it there to freak you out

 

I can confirm what others have said. I produced my own baby goblet when I dropped a 40 S&W at the range, bent down and picked "it" up, loaded it and fired. No problems observed, felt, or heard...but produced a very neat goblet. Somehow, my EMP 40 held the 9mm evenly in the chamber, as my fired case was very symmetrical. Sadly, my son grabbed it for his own collection before I could.
I've never been tempted to try it on purpose...and since then, I examine all dropped and "found" rounds to verify it's what I was shooting.

 

Rectal cranial inversion. As others said, fired in a chamber not intended for it.

 

I picked up a 9mm fired in a 40 cal chamber, and that round split down the side. That shooter got a big gas release, might have blown out the magazine.

 

Check for pair of stained shorts in the bin.

 

Ok, that makes perfect sense. Think I'll keep that souvenir just as a reminder.
My wife once fired a .380 in a 9mm. Only thing we noticed is that it didn't eject.
Ya'll be careful out there
Cliff

 

I LOVE 40/9 brass! Never wanted to make it on purpose, but I love seeing the results afterwards.

 

What's really crazy is I found 4 of them, same headstamp, same area of the range. I guess some shooters really can be that stupid.

 

Probably went, "Dang, why won't this ammo cycle the slide?"

Or the shooter could have been curious what shooting 9mm in a 40S&W barrel would be like and was doing some "myth busting".

 

Yeh, 9mm fired from a 40.
The extractor holds the round against the slide face and the firing pin is able to set it off.
That'll make a funny sound and you can usually see the bullet in flight if you are standing behind the shooter (holding a timer).
And yes, the bullet hit the steel target and sounded like a pellet hit it.

.

 

Thats the new wildcat 9mm-40. I bet those dies are going to be very expensive.

 

Sizes from the bottom lol

 

So they DO headspace on the extractor!

 

I'll give in. It was fired in a .45.

 

While 9mm case rim can be held by 40S&W extractor for striker/firing pin to hit the primer, I am not sure if 45ACP extractor will hold 9mm case rim properly for striker/firing pin to hit the primer.

 

I've witnessed it.

 

I've done it

 

If it was fired OOB, think about where the bulge would be. That is, of course, if the brass and everything else survived.

 

I have even seen 264 win mag fired from 300 Weatherby. Guy went from doing Ok to not even making it on paper.

I wish I had asked for one of the cases or at least had a camera handy back then. There was no neck anymore and it had been blown into a now fluted shoulder.

 

I shot a .380 from my P228/9mm. The sound and recoil were the give away. Otherwise it worked as it should. Of course it wasn't me who loaded it into the magazine. Must have been my shooting buddy, son. LOL

 

"one of those cases"
you mean there was more than one.

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