300 blackout will chamber in 5.56!?

[zachomega]

I learned something new today. Not firsthand thankfully.

Apparently 300 blackout will seemingly load into the chamber of a 5.56 rifle.

Bad things will happen. But the bolt will close.

This is a non issue for me as I don't have 300 blackout. But seriously keep your ammo separated.

-Zach

[abner13]

Most likely , the .22cal bullet will not come out of the .30cal bore with any speed. No pressure would build up. Certainly not 55,000psi. Firing a .357 Sig out of a .40 S&W barrel was anti-climatic to say the least.

[raxar]

Most likely , the .22cal bullet will not come out of the .30cal bore with any speed. No pressure would build up. Certainly not 55,000psi. Firing a .357 Sig out of a .40 S&W barrel was anti-climatic to say the least.

He is talking about the other way around.

[imashooter2]

I put one of Squirrel Daddy*s engraved ejection port covers on mine. Far from foolproof, but it does provide a visual reference.

https://www.squirreldaddy.com/300-AA...r-p/22-101.htm

[Delkal]

The FIRST rule of wildcatting is that if you neck up a parent case it should not be able to chamber. I think the inventors of the 300 BO had to know this so something is wrong here.

Do they mean a standard commercial loaded BO will chamber or is it someone putting a light bullet and seating it way under spec? Still not a good design but handloaders can do stuff like that.

[raxar]

The FIRST rule of wildcatting is that if you neck up a parent case it should not be able to chamber. I think the inventors of the 300 BO had to know this so something is wrong here.

Do they mean a standard commercial loaded BO will chamber or is it someone putting a light bullet and seating it way under spec? Still not a good design but handloaders can do stuff like that.

.300 black out in a 5.56 barrel is a known thing.

[Bang]

https://youtu.be/RbfIkaNlECo

[wanneroo]

Yes it's something that can happen but it just comes down to being not careless and stupid and paying attention to what you are doing.

[Delkal]

https://youtu.be/RbfIkaNlECo

I watched that video but that guy is a hack. He said he loaded it with a 110 grain bullet with "a decent amount of powder" so the bullet can get out of the barrel. WTF does that mean?

And he blew up an AR for only 230,000 views? Dumb ass.

[MikeStull]

A picture is worth a thousand words. This article has a photo of 300 Blackout and 5.56 rounds side by side. I can see how the 300 Blackout might chamber in a 5.53 barrel. It will not be a pleasant outcome.