[Clint N. Suhks]

Even use the same 5.56 magazines.

No way!

[mylife]

Its basically a .223 shell that has been renecked for 30 cal.

I like the idea of it. Ammo could be a problem to get, but it would be readily available if you roll your own since .223 brass and 30 cal bullets are ubiquitous.

There seems to be some controversy as to .223 brass being safe after resizing.

[smokingfrog]

300 AAC BLACKOUT Black Rifle Manual.