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Thread: Colt Expanse Kaboom

  1. #21
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    Quote Originally Posted by GH41 View Post
    I hate to say this because I have a ton of Federal ammo but if you google it you will find more than one ka-boom story.
    With Federal being probably the biggest ammo supplier out there for .223/5.56, it would make sense from a statistical standpoint that they would also have the most "Kaboom's". Now a "kaboom per capita" ratio would probably be more appropriate to see if it's really a federal problem or not, but good luck with that data.
    -Colt 6920 w/Aimpoint PRO

  2. #22
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    What is the difference between the Federal 5.56 mm Military Grade and M193 that comes in a tan box? Is it the same ammunition?

  3. #23
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    Is it possible the bolt broke on the previous shot and that's why he had to dismount the arm from his shoulder and rack it using the charging handle? When he does, you can see the round that was in the chamber eject out to 3 o'clock from the rifle, where it then lies on the range table w/ what looks like the bullet intact just hanging over the edge.

    A cracked bolt might also explain why he then drops the rifle again to get it to 'feed correctly' or whatever other manipulation was done while the rifle is out of sight due to the camera position.

    Perhaps the unconstrained gas flowing through the already cracked bolt caused that damage? That may mean the ammo was fine.
    Last edited by Lefty223; 03-09-17 at 12:41.

  4. #24
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    No. Nothing about a cracked bolt causes the case to become liquid. See how the case head is all melted looking? Pressure does that, and way more than 62,000psi.

  5. #25
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    Can someone link to the thread on arf?

  6. #26
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    Quote Originally Posted by ww2farmer View Post
    If it wasn't from a squib ( I didn't see where you said they looked down the barrel with a light to check for internal ringing, squibs don't always produce a pronounced easy to see/feel bulge on the outside of a barrel), or an OOB discharge, the only other culprit is the ammo, as no amount of other problems with a functioning AR would cause that.

    That's the kind of kaboom that happens when you have a full charge of fast burning pistol powder in a rifle cartridge case.

    You do know that a squib is an ammo problem, right?
    Stick


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  7. #27
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    Quote Originally Posted by markm View Post
    Jookie ammo is my vote. I've no idea what that box is, but Federal and 5.56 are generally a problem.
    Federal 5.56 is problem ammo?

    Or is it because the gun might not have been a 5.56mm chamber.

  8. #28
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    With the information available, I suspect the problem lies with the ammunition. Weak brass in the web area or the case neck bearing on the leade would cause this issue. The correct charge weight of the wrong powder would also cause this issue.

    I would first check the barrel with a TE gauge to rule that out. I would also make a chamber casting using Cerrosafe or a comparable compound and measure chamber diameter just ahead of the bearing surface of the bolt.

    I would measure loaded cartridges, paying special attention to the brass headspace and crimp. I would also disassemble a few cartridges, measure the brass, projectile and charge weights.

    Has Federal cartridge company been contacted?
    Last edited by T2C; 03-09-17 at 21:31.

  9. #29
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    Quote Originally Posted by Ed L. View Post
    Or is it because the gun might not have been a 5.56mm chamber.
    Not a tight chamber problem. That causes dropped primers and a little flow into the ejector hole, called swipes. This is way more pressure than that. Way more.

  10. #30
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    Quote Originally Posted by Junkie View Post
    Can someone link to the thread on arf?
    I'm pretty sure posting any ARFcom link is not allowed. I don't frequent there and am taking a look myself now. It's a chore finding the right kaboom thread, it seems they have rifles blow up ALL THE TIME...

    This thread is interesting to me, I recently came into possession of ~330 rounds of 75 gr HPR ammo. The last round fired from this stash caused a kaboom, quite similar to the one posted here, although a little less catastrophic. I only got to see the range rental rifle for a couple minutes. I'm going to pull the projectiles, throw away the powder, and reload with a reasonable amount of XBR.

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