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Thread: 300 Blackout Fired In 223

  1. #1
    Member zimmer's Avatar
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  2. #2
    Almost literate. veitnamcam's Avatar
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    That 308 projectile at the bottom is amazing!
    Would never have thought it could extrude so nicely into a 5.56 bore.
    Steve123 likes this.
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  3. #3
    Member wsm junkie's Avatar
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    I remember talking to a guy that fired a 308 in his 2506....split the reciever open like a banana skin, blew out mag well and siezed the bolt in place.....bloody lucky he didnt get hurt
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    Nasty stuff, my brother gave a guy a 7x57 round for his cartridge collection at a range shoot and some how this guy chambered and shot it in his 270. The rifle held together but booted the hell out of him, the diameters are close at .284 and. 277 but that's sure playing with fire.
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  5. #5
    Member Marty Henry's Avatar
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    There are actually quite a few cartridges where cross chambering is possible that's a valuable reminder.
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  6. #6
    MB
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    Good to know. I wouldn't have thought it possible. Everyday is a learning day. Luckily, I don't own a .223. Some of the comments are mildly amusing.

  7. #7
    Member Ben Waimata's Avatar
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    Is it possible to fire .223 through blk barrell? I assume it will not chamber fully?

  8. #8
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    Greetings Zimmer,
    In the US they generally try not to have miss matches like that. The .280 Rem and 7mm WSM were both given longer headspace to stop them being chambered in the .270 Win and .270 WSM respectively. I suppose the .300 Blackout initially being a proprietary cartridge it may have missed that step. Just shows you can't be too careful and we should be careful with our calibre selections and especially reforming brass from one calibre to another. I prefer to make 6.5-06 brass from .26-06 cases partly for that reason.
    Regards Grandpamac.

  9. #9
    Member Micky Duck's Avatar
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    only some blackout loads will chamber.depends on the projectile.always thought in combat dropping weapon as running away with couple of 5.56 loads on top and blackout under would be cunning ploy....
    there has been morethan one 308 fired through 270 before....not recomended.
    Mooseman likes this.

  10. #10
    Member 300CALMAN's Avatar
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    Quote Originally Posted by veitnamcam View Post
    That 308 projectile at the bottom is amazing!
    Would never have thought it could extrude so nicely into a 5.56 bore.
    the legendary squeeze bore! Wounder what the BC of that would be.

    But unfortunately yes 300 will fit in 223, not the other way round.

    We managed to fire some 308 out of 7.26x54R, tied to a tree with a string to pull the trigger. Worked well.

  11. #11
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    Greetings All,
    A mistake made in the US in post war years was firing an armor piercing 7.92mm German round in a .30-06. Last shot for the rifle and not all that good for the hunter either.
    Regards Grandpamac.

  12. #12
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    Not quite as bad is getting a 5.56 semi jammed up with a double feed - two rounds in the chamber at once. Normally that doesn't fire but it's a total pain in the arse to clear. Looks spectacular when you get them out too.

    There's another combo that is renowned for causing carnage, can't quite recall off the top of my head but I think one was the 6.5x55 getting crossed up with something else and the Swedish Mauser action definately not liking the results.

  13. #13
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    Greetings All,
    There were also stories about a 6.5 mm Arisaka being rechambered for the .30-06 after WW2. The owner hunted with it and shot a few deer with it but the recoil was major. He took it to a gunsmith who discovered the problem. He was using standard .30-06 rounds and the pill was being swaged down to 6.5 in the barrel. I believe that this was written up in the NRA Journal at the time. Amazingly the action took the beating but not the hunters shoulder.
    Regards Grandpamac.

  14. #14
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    I can relate to this comment, Get people not knowing enough about cast bullets asking all sort of stupid questions that the answer is quite obvious if they thought about it.

    “Had some dude come into the store the other day wanting .300 Blackout ammo to shoot in his 5.56 AR. It took 15 minutes of explaining for him to understand you got to have a .300 Blackout Upper!” — R. Williams

 

 

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