Guess what happened here.

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Like the title says you have to guess what happened the win, be very specific.

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2 pieces of brass just different views.
 
Something loose in the action allowing the bolt to slide back before the bullet clears the muzzle, allowing gas expansion to occur inside the brass.
 
It looks as though they were fired completely out of battery. Or they were the two rounds directly beneath a round that fired partially out of battery. There doesn't appear to have been any chamber support whatsoever. Perhaps they were loaded as shot in a 12 gauge?
 
Something loose in the action allowing the bolt to slide back before the bullet clears the muzzle, allowing gas expansion to occur inside the brass.

good guess and Ive seen that before but thats not what happened here
 
Perhaps an open bolt firearm had a case lodged in the chamber and these rounds were subsequently ignited out of battery. Maybe you used them as reactive targets?
 
If both were fired from the same gun, either it malfunctioned seriously twice or this was the intended consequence. It looks crushed front to back so unlikely completely chambered when it happened. Was it a target that was shot with something else?

Can we see a shot of the Primer area? Caliber?
 
It looks as though they were fired completely out of battery. Or they were the two rounds directly beneath a round that fired partially out of battery. There doesn't appear to have been any chamber support whatsoever. Perhaps they were loaded as shot in a 12 gauge?

WINNER:Klyph

Both are 9mm rounds and reloads tho pressure wasn't the problem. Klyph got it right as both rounds were fired completely out of battery. I was playing around with lighten springs so that was most likely the cause but the firing pin was also bent and stuck out so not 100% sure. The rounds jammed with the nose in the chamber and when the slide tired to close it set them off lodging the round in the barrel and exploding the case.
 
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fired out of battery causing a case blowout. Could likely have caused catastrophic failure of the firearm as well, and possibly injury to the shooter or bystanders.
 
Doesn't everyone's brass look like that?

PS: the OP disclosed the answer already. Would like to see the firearm in question.
 
Firearm was a hi point c9 I do all my crazy reload testing and gunsmithing idea's on this gun because tho it's not 100% reliable it's a tank and I don't want to hurt any of my nice guns.

After the first explosion I looked down to see if my hand was still there and it was a little black but unharmed. So I disabled the gun and beat the lead round out of the barrel and took the hunk of brass out and looks over the gun and decided it was fine and did some more shooting untill it happened again than I pulled the springs and changed to a firing pin that wasn't bent and it works like a champ again. The Hi point it's self is fine and shows no signs that it ever even happened.
 
lol maybe But I have confidence that you couldn't blow this gun up if you tired so I wasn't worried.
 
I agree about not blowing up the gun, as I've seen some crazy YouTube vids of shooting the hi point with a bolt screwed into the barrel for an obstruction. HOWEVER, it isn't the gun I'd be concerned with!!! I'm glad the second one was enough to convince you to look into it further.
 
The bent firing pin made this essentially a fixed firing pin firearm. I've always been curious how fixed pin open bolt firearms avoid firing out of battery. It seems like it would be common.
 
Ironic that the toughest gun around is one that is generally derided as a POS. I don't hold this opinion, but many do.

After the first explosion I looked down to see if my hand was still there and it was a little black but unharmed.

Can you expand on this? How sore was your hand? How black was it? Were you wearing gloves the second time? :)
 
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