Quote Originally Posted by Former11B View Post
I have definitely read one or two 300 BLK through 5.56 barrel threads where the bullet made out through the tube. Not sure if they were SBRs or what, but I am not making it up. I remember the surprise in the original thread I saw about the bullet making it out. The poster was surprised because no projectile was present, and there was some damage to the rifling, IIRC, so it went somewhere. People shooting 300 BLK through a .223 happens enough to the point I wouldn't rule anything out.
Here's one picture I found:

If the .300 BLK bullet was light enough with enough powder behind it/thin enough jacket, it could squeeze down enough to make it out of a short barrel 5.56/.223

Wow, that's crazy. I just assumed the weakest point of escape would still be blowing the bolt/carrier back going out the receivers.

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