Bellied 9MM case found at the range.

Looks reloadable to me.

I got a couple just like that in some once fire brass recently.

Any guesses on the cause of that?

Shot from a blow back carbine?

From an open bolt SMG?

lee bulge buster will fix that right up

That's some kind of out of battery firing.
Maybe got a 9 to fire in a 380.

Its the new 9mm bellied magnum.

slicksleeve said:

Its the new 9mm bellied magnum.

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Yep, my first thought too...9mm weatherby.

9mm fired in a .380. Probably and older one without a firing pin safety.

Its the new 9mm bellied magnum.

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Yep, my first thought too...9mm weatherby

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Looks like that 9mm supermag is a bit hard on the case mouth.
Looks like the brass did its job and didn't fail.

Fired in a .380/9MAK maybe??

Mak in a 380?

If it isn't truly the experimental Federal "Muffin-Top" Magnum, I'd wager it's 9mm fired from a .380acp chamber as others have said. I would like to know the answer for sure; mysteries with no definitive answers irk me.

Nature Boy said:

Bat Rastard said:

Any guesses on the cause of that?

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Shot from a blow back carbine?

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Likely shot from AR carbine with insufficient buffer weight causing bolt to move away from chamber prematurely.

Pistol Caliber Carbines must use heavier buffer to hold bolt against chamber long enough to contain pressures - https://www.thehighroad.org/index.p...d-you-use-and-why.825314/page-2#post-10643679

bds said:

Likely shot from AR carbine with insufficient buffer weight causing bolt to move away from chamber prematurely.

Pistol Caliber Carbines must use heavier buffer to hold bolt against chamber long enough to contain pressures - https://www.thehighroad.org/index.p...d-you-use-and-why.825314/page-2#post-10643679

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Could be, but would that explain the compression at the case mouth? That's kinda why I'm thinking the chamber was too short (.380?) and the bolt/slide was trying to drive it in further.

NIGHTLORD40K said:

explain the compression at the case mouth?

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Likely that happened after case was fired. Think about it. Loaded 9mm will head space off case mouth in 380. In order for the loaded round to go further in the chamber/barrel, bullet must compress which is unlikely and chances are 380 pistol won't fire out of battery.

The "muffin top" 9mm brass fired from PCC due to premature bolt movement away from barrel chamber is a known issue and case mouth likely got damaged after extraction.

Here's a thread showing same exact muffin top brass - https://www.ar15.com/forums/ar-15/Insane_case_bulging_with_new_9mm_AR_pistol_______/15-589722/

Per 1moreford’s guess an open bolt SMG has a fixed firing pin. A 380 in a M11 will allow the bolt to close all the way a 9mm would be set off partially open.

Anything that stops short, and inline would get a primer strike.



That said, brass isn’t that strong, so for it to survive that situation it would have to be a very weak load.

This is the ammo world's equivalent of the Vietnamese "pot bellied pig".

Bat Rastard said:

Any guesses on the cause of that?

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Too much Turkey?
Happy Thanksgiving!

No problem. That'll buff right out.

Muffintop.. I love it.

Perhaps it started with " hold my beer" ... all in joking as I don't condone alcohol and firearms, just putting a disclaimer on my humor

I have never seen brass like that, very strange!

9mm Tubs

Roll your own fatty 9