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?