Though they are similar in overall size, the . 300 Blackout has a slightly longer overall length (2.26″ vs 2.2″), but the 7.62x39mm has a slightly longer case length (1.528″ vs 1.368″). The picture above compares a Norinco 7.62x39mm cartridge with a 122gr FMJ bullet to a Sellier & Bellot .
What other ammo can you shoot in a 300 blackout?
300 Blackout uses a . 223 case cut down to accept the . 30-caliber bullet, meaning the bolt and magazine for a . 223 or 5.56 firearm would work for a .1 sept 2016
Can you reload 300 Blackout with 223 dies?
223 or 556 case reformed should work fine in a smaller sized chamber. If you use Lee dies to re-size already fired 300 blackout cases, or actual 300 blackout brass, they will work perfectly. see less That is a loaded question.