Keep your .300 BLK and your 5.56 ammo straight

.300 BLK fired in a 5.56 chamber....

https://rifleshooter.com/2019/08/another-300-blk-in-5-56-barrel-kaboom/

All things considered it contained the explosion enough to prevent injury. Damage to the rifle was extensive though.

Check out the fire formed .22 projectile.

Eh. If his parts were Mil-Spec, he wouldn’t have had that problem.

But seriously, with the difference in projectile diameter, shouldn’t there have been some sign that something was wrong before firing?

Thanks for the post - will be sharing it with some buds.

Burt Gummer said:

But seriously, with the difference in projectile diameter, shouldn’t there have been some sign that something was wrong before firing?

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I think, as with all things in life, it depends.

Shape and length of the .30 cal projectile matters for sure. Some can chamber in a 5.56 easier than others. From reading the article my take was the owner of this rifle had a friend shooting it when he grabbed the wrong mag. Perhaps that friend wasn't as versed in the platform and didn't know enough to say "hey that felt funny" when he dropped the bolt on a bomb.

rantingredneck said:

. From reading the article my take was the owner of this rifle had a friend shooting it when he grabbed the wrong mag. Perhaps that friend wasn't as versed in the platform and didn't know enough to say "hey that felt funny" when he dropped the bolt on a bomb.

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And it is mostly ^ that reason that I paint my .300BLK rifles/pistols and mags to match. Camo mag, camo gun. Black mag, Black gun.

I have teenagers and less experienced adults shooting my rifles often.

Burt Gummer said:

But seriously, with the difference in projectile diameter, shouldn’t there have been some sign that something was wrong before firing?

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It all depends on the level of crimping. All it takes is the bullet to setback into the cartridge and a 300blkout will chamber in a 556/223.

John

They were only 115gr 30 cal so they aren't protruding much at all. That is one of the smallest bullets for 300blk

Goofyfoot2001 said:

They were only 115gr 30 cal so they aren't protruding much at all. That is one of the smallest bullets for 300blk

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But it makes one helluva long 22 cal bullet, lol.
Wow...

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This is why I exclusively use Lancer mags for 300BLK and PMAGs for .223.

The pics of the bullet after being fire formed to .223 are very cool!

Once again Mr Stoners invention did it's job of containing the carnage. Several times I have seen this and several times nobody lost any fingers or eyes. I'm sure they lost their bowel control.

Nothing a little JB weld won't fix. Also, there's a Wilson Combat 5.56 barrel out there for sale somewhere, barely used, less than a hundred rounds thru it

Jerzsubbie said:

This is why I exclusively use Lancer mags for 300BLK and PMAGs for .223.

The pics of the bullet after being fire formed to .223 are very cool!

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I'm surprised they were able to push it out with a cleaning rod.