I heard those stories about .300 Blackouts firing in a 5.56, but I checked a 5.56 barrel, and it looked like the Bolt would be about 1/16" from letting the bolt go into battery. Has anyone else made similar measurements?
I fail to see how a 30 caliber bullet would fit in a .224 chamber given how delicate the platform is. I mean even a grain of sand seems to mess them up...
