dont put 300blk in a 223......

**Coug91** · 06-10-13, 21:11

That's not gonna buff out.

**MistWolf** · 06-10-13, 21:43

Originally Posted by darr3239

It is possible to chamber a 300 BLK in a 5.56. With enough force, the bullet can be forced back into the casing, allowing the case to enter the chamber.

Have you done this or actually seen it done? Not only does the bullet have to be seated deep into the case, the neck and shoulder would have to be crushed

Doing the opposite, by trying to insert a 5.56 into a 300 BLK, doesn't create a problem. The cartridge is longer, and doesn't chamber. Even if it did, there wouldn't be much of a consequence.

If somebody can crush the case of a 300 BLK enough to fire in a 5.56 case, they'll be able to crush the 5.56 enough to fit in a 300 BLK chamber

**AKDoug** · 06-10-13, 21:54

Originally Posted by MistWolf

Have you done this or actually seen it done? Not only does the bullet have to be seated deep into the case, the neck and shoulder would have to be crushed

If somebody can crush the case of a 300 BLK enough to fire in a 5.56 case, they'll be able to crush the 5.56 enough to fit in a 300 BLK chamber

Actually, no. The case mouth on the BLK is lower than the shoulder on the 5.56 Take a look at this picture.

Three .300 BLK rounds, a 5.56x45, and a 7.62x39. I am suprised, though, that you can compress power in that .300 that much with just a bolt carrier.

**simonsez** · 06-10-13, 22:19

Ouch! Is the shooter ok?

**RearwardAssist** · 06-10-13, 22:39

Originally Posted by The_War_Wagon

Hope he and any bystanders were permanently disfigured!

Typo? If not what's a matter with you why would you hope that happens to anyone?

**darr3239** · 06-10-13, 23:56

Thanks for posting the photo Doug.

With un-crimped bullets, and a low powder load for subsonic, it probably isn't too hard to send the bullet further into the case. In any case, there have been several accounts of it happening.