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Can a 300BLK round be chambered in a 223 Rem?

1K views 13 replies 9 participants last post by  mcbammer 
#1 ·
Since the .300 blk is a .308 bullet in a .223 case , is it possible it can be chambered and fired by mistake in a .223 barrel ? ,which would be catastrophic .
 
#4 ·

It looks to me to be too fat at the neck area unless you slammed the barrel closed pushing the bullet deeper into the case... I never tried to fit one in the other but possibly could be a forced catastrophe with heavy bullets. But the little 110 gr or 125 gr I shoot may chamber.... thejanitor
 
#10 ·
#8 ·
All depends on how long that .30 cal bullet was set, or if it can be set back a bit by bolt slamming home.


Similar to the one powder on the bench rule, if you own both, only one (correct) ammo on the bench at a time.
 
#9 ·
It did not take long for a 300Blk to be fired in a 5.56 (.223) barrel. I was an early adopter of this caliber and was researching many aspects of reloading for it. The image like shown above was circulated on most boards discussing the 300Blk, the warning came out very early on, but it happened anyway, and keeps happening.

https://www.thefirearmblog.com/blog/2015/07/25/psa-saamis-guide-to-unsafe-gun-ammo-combinations/


https://saami.org/technical-information/unsafe-firearm-ammunition-combinations/
 
#11 ·
It did not take long for a 300Blk to be fired in a 5.56 (.223) barrel. I was an early adopter of this caliber and was researching many aspects of reloading for it. The image like shown above was circulated on most boards discussing the 300Blk, the warning came out very early on, but it happened anyway, and keeps happening.

https://www.thefirearmblog.com/blog/2015/07/25/psa-saamis-guide-to-unsafe-gun-ammo-combinations/


https://saami.org/technical-information/unsafe-firearm-ammunition-combinations/
I'm stealing this picture. I've never seen anything like this before.
 
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