Anyone accidentally used 300 blkout in 556?

[titsonritz]

I’ve always wanted a .300 for a super short suppressed rifle, but I have avoided it for the reasons in this thread.


What are y’all talking about with the Lancer mags?

Same here. I make a point to avoid similar rounds. Same reason I got rid of 40 S&W, it is too easy to confuse with 9mm.

I'm more concerned about a loose rounds finding their way into the mags then using wrong mags.

[jsbhike]

Same here. I make a point to avoid similar rounds. Same reason I got rid of 40 S&W, it is too easy to confuse with 9mm.

I'm more concerned about a loose rounds finding their way into the mags then using wrong mags.

Found a 9mm case fired from a .40 or 2 at ranges.

Back when I was reloading 9mm/.45ACP(and a lot of range pick up brass) I despised .40 S&W since it was common and would snarl up the press case feed with both.

.380 & 9x18 were irritating too, just not as frequently encountered.

[3 AE]

Reading all the posts in this thread about how a 300BO round can be loaded into a 5.56 mag, chambered into a 5.56 barrel, and fired with disastrous results. Would the opposite hold true? Can a 5.56 round be chambered into a 300BO barrel and fired? If so, what are the results?

[titsonritz]

Reading all the posts in this thread about how a 300BO round can be loaded into a 5.56 mag, chambered into a 5.56 barrel, and fired with disastrous results. Would the opposite hold true? Can a 5.56 round be chambered into a 300BO barrel and fired? If so, what are the results?

Probably not the best thing for the gun but at least the bullet will make it out of the barrel. I recently saw a guy run a 5.56 through a 7.62 AK, nothing catastrophic happened except to the brass. I made a joke about the old myth the Russian made their AK able to shoot American rounds but not the other way around. "See, it's true"

[26 Inf]

Reading all the posts in this thread about how a 300BO round can be loaded into a 5.56 mag, chambered into a 5.56 barrel, and fired with disastrous results. Would the opposite hold true? Can a 5.56 round be chambered into a 300BO barrel and fired? If so, what are the results?

This was a post from the first page by Clint:

We put 5.56 once in an identically configured 6.8SPC.

The round went bang and a big swirl of blue smoke emanated from every orifice in the reciever.

Rifle and shooter were unharmed.

The bullet left the bore.

The case split across the base and ballooned the neck.

It was more like a low pressure event than an over pressure event.

Since the 300 Blackout barrel is essentially 7.62, it is larger than the 6.8 and seemingly would vent more down the barrel making it a seemingly 'lower pressure event.'

Still comes under the heading of 'Kids, don't try this at home.'

[mack7.62]

Right the dangerous condition is firing a bullet larger than the bore diameter, bullet lodges in bore and pressure has to go somewhere. Firing a bullet smaller than bore diameter likely will cause no damage.

[BFS]

Pretty sure Faxon ran .300 through their 5.56 ARAK upper during destructive testing. IIRC, it survived and fired after. Cant find the original post though.

[msnyder0609]

It happened to a friend of mine...The video definitely made the rounds on IG.

https://www.instagram.com/p/Bq5yuHqHxV7/?hl=en

[titsonritz]

It happened to a friend of mine...The video definitely made the rounds on IG.

https://www.instagram.com/p/Bq5yuHqHxV7/?hl=en

Ouch, with a bullpup no less. Hope your friend is better off than the gun.

[jackblack73]

Pretty sure Faxon ran .300 through their 5.56 ARAK upper during destructive testing. IIRC, it survived and fired after. Cant find the original post though.

That’s pretty hard to believe. Do you know where you saw that? I tried googling but couldn’t find anything.