What caused this

[thopkins22]

Actually I was thinking a .222 in the .223 chamber. I mean, it would go but should not fire.... but it's not impossible. I would say a .223 in a .222 chamber, with the bolt so far out of battery, it would never fire.

That’s what I meant...mixed up chamber and cartridge in my post.

Given that we don’t know what firearm was at play, I think it’s entirely possible that a controlled round feed/claw extractor held the round in place against the breech face. It would explain a lot...but who the hell does it twice?

[Ned Christiansen]

Bubba! :-)

[bigedp51]

The case was marked Lake City, below is the original link. And I had hoped someone here had seen this happen before and now we have a mystery.

Found this in my brass bucket, what caused it?
https://www.ingunowners.com/forums/a...ml#post7748284

Now I think the case ejected at the speed of light and hit "warp speed".

[MegademiC]

My friend had a polish tantal that did this, though not as bad- but it was steel cased ammo 5.45.
I believe he sold it, full disclosure due to the issue. I disnt know enough at the time to really dig in. We just assumed an out of spec chamber.

[Bimmer]

No that I think of it, a friend's Makarov did this to .380ACP brass. (Yes, it was chambered in 9x17, not 9x18.)

The Makarov only bulged brass on one side, so we figured it was that the feed ramp wasn't supporting the cases enough.

[noylj]

Gross headspace problem or out of battery. Not something I would attempt to duplicate.

[jaholder]

Overpressure, bolt's unlocking with chamber still under enough pressure to deform the case as it extracts.

Bad, bad juju.

[markm]

No that I think of it, a friend's Makarov did this to .380ACP brass. (Yes, it was chambered in 9x17, not 9x18.)

The Makarov only bulged brass on one side, so we figured it was that the feed ramp wasn't supporting the cases enough.

Yeah. Glocks are known for this... at least in 40 cal. Some company even made the Glock Rx die to remove the buldge.

[Bimmer]

Yeah. Glocks are known for this... at least in 40 cal.

I keep hearing this, but I've never seen it.

I have seven Glocks chambered in .40 (most of my pistols are .40 Glocks).

I've fired tens of thousands of rounds through them, and I've never seen a bulged case, including shooting high-pressure Gold Dots and the like.

[markm]

I've seen it on my gen 2. I didn't know what it was at first...