I didn't think it was possible

the person that shot that one is I would say very lucky if that was the only damage that occurred. Not the first and probably will not be the last time such has happened.

From what i read in some cases the bolt slams the round with enough force to push the projectile far enough into the case that the action will close and lock. After that its a schnitzel show.

Or ...how to make your own VLDs the hard way

I still don’t think it’s possible. Perhaps to actually get one to fire, but not squeeze the bullet perfectly into .223 diameter.

The pressure is certainly there to "squeeze" the bullet down the barrel, depending on the type of bullet shot. But I also wouldn't think it would do that. But a softer lead or bonded bullet (bonded bullets are generally softer lead) may allow that. The one's I have actually known a blk out fired into a 223, the rifle came apart at the breech and damaged multiple parts.

The blk out won't typically fit into a 223 Rem/5.56 chamber. The 30 caliber bullet ogive sits well forward of the 223 shoulder, so it won't chamber. For it to chamber, the bullet would have to be set back into the case quite a bit to chamber. There's several factor's that have to happen to allow it to chamber. 1- the powder charge needs to be low enough that the bullet can move deeper into the case. If you load the blk out at or near max pressure/velocity, the powder charge will generally be a compressed load anyway. Therefore, the bullet can not set back. 2- the crimp needs to be firm enough to assist in keeping the bullet in place. Yes, you can still have bullet set back in a crimped case. But #1 above should prevent this, if there is a weak crimp.

Wow.

I wonder what the BC is on that bullet.

Thats why I only 5.56 or 458 on the AR platform. 300blk was always non-appealing to me, if i want a 30cal ill just grab an AR10

I was standing next to a buddy when this exact scenario played out about 5 years ago. Neither he, nor I, own a 300 BO. Turns out the ammo he bought had a 300 BO round in the 556 box, he had used a “speed loader” to load the magazine and didn’t notice it.

Long story short....his Rock river blew apart. The bullet made it ~6 inches down the barrel and looked similar ( Rock River sectioned the barrel).

Scary moment for us both, thankfully no injuries.

Wonder if this is that sectioned barrel



300BO in a sectioned 223 chamber

Doesn’t make sense to me, either. I just can’t imagine the bullet would be that long, even if it is possible.

Glad everyone is safe but that's wicked looking.

Iirc the 90gr 223 bullets I have are 1.25 inches, depending on which bullet was used an extra 20 to 60 grains could make for a long bullet

I guess so. I just can’t wrap my head around that one.

I don't buy it. Bullet is way too clean and nice.

That sounds....fishy..... to say the least.

Was this some gun show special ammo, or some that had questionable origins?

I know factory ammo has problems from time to time—but loading ONE incorrect cartridge into a box seems pretty unlikely to me.

Not that uncommon that there is a wrong bullet in a box or even a few. Some happens when someone is looking at the rounds by opening the box. Saw a box of higher end ammo with cheap in it, another was a box of 7mm WBY ammo with 7mm Rem Mag ammo in it. Sometimes the "mix-ups are done by "customers"

First off: I don’t buy a whole lot of centerfire ammo; most of what I shoot is handloaded.
Secondly: I bought some hornady custom 454 casull that had a bad primer... I understand mistakes happen at the factory.


Lastly.....a customer mixing up ammo definitely falls into the “fishy” category.



Admittedly, I’ve never toured an ammunition factory, but it seems extremely odd to me that a cartridge that did not use the same bullet, powder, or case ended up being packaged with a completely different cartridge that happened to share the same bolt face diameter.

My best guess is that a customer accidentally switched the ammo like Kmon1 said above. All I know for sure is neither of us own (or have ever owned) a 300 BO. Somehow a 300 BO round was mixed in and the result looked very similar to the sectioned barrel shown earlier in this post.

We thought we had a squib situation and weren’t sure until Rock River sectioned the barrel.

I have seen this happen first hand. A similar chain of events- bullet fired and blew out the magazine, but in the case I witnessed, the bullet cleared the barrel. We were actually able to recover the bullet from the trap- it was beaten up and a little curved from bouncing around the trap, but was probably 2-2.5 inches long. Used to pass it around before classes as a warning.