.300 Blackout fired in a .223 barrel

[NightShade]

Saw this on another site and it's kinda crazy. Someone accidentally stuck a .300 Blackout round in a .223 barrel and fired it. The bullet went part way down the barrel before the back of the brass blew out.

http://www.weapon-blog.com/2014/03/300-blk-through-5-56-barrel/

I have to wonder though, would the round actually drop in without having to hammer the forward assist to force the bcg closed?

 

[ByrdC130]

Sure made for a looooong bullet.

 

[Boehlertaught]

Too bad they don't make 556 bullets like that...may have a really high ballistic coefficient.

 

[Okie4570]

Too bad they don't make 556 bullets like that...may have a really high ballistic coefficient.

And might require a 1:2 twist

 

[AKguy1985]

Whoah......

How did the bolt even close is what i'm wondering.

 

[Brandi]

How would a .30 caliber bullet even fit in the .223 chamber? I'm no gunsmith but I'm not sure this is possible. That's one really long bullet now, more like a small spear than a bullet.

 

[NightShade]

How would a .30 caliber bullet even fit in the .223 chamber? I'm no gunsmith but I'm not sure this is possible. That's one really long bullet now, more like a small spear than a bullet.

I am guessing that the guy hammered the forward assist to force it closed pushing the bullet farther down in the case than it was supposed to be. But I was wondering the exact same thing myself.

 

[Old Fart]

.223/5.56 body dia is around .378, so a crappy throat job and it would slide in there maybe.

 

[SMS]

It can happen. Here's another instance...the interwebs is full of these accounts.

http://www.thefirearmblog.com/blog/2013/12/18/300blk-fired-5-56-fs2000/

...and here. Crappy video but a .300 round clearly chambers enough to allow the hammer to drop.

http://www.youtube.com/watch?v=lmcHAEUuews