PSA: Using 300 blk and .223/5.56 Rifles at the same shooting session

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  • John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,734
    Socialist State of Maryland
    I have seen three Colt 5.56 AR's blow up due to a primer launched bullet which obstructed the bore after the next round pushed it in. In all three cases, the lower part of the BCG blew out, the bolt damage was similar to the .300 BO pics but the barrels were not damaged and the upper receivers only bulged a little. The blast for the most part came out through the magazine. Two I know loaded with 25.5 of WW 748 which gives around 50,000 PSI.

    I wonder what the pressure was in that .300 BO to cause that kind of damage. :eek:
     

    danb

    dont be a dumbass
    Feb 24, 2013
    22,704
    google is your friend, I am not.
    Back in the day, they made 357 a little longer so it would not chamber in a 38 spl. When people designed the 300blk they though we had evolved, and yet, here we are. This is not the 1st, 2nd, 3rd, or even 4th time Ive seen this.

    I think that eventually they will have to fix 300 blk to address this problem.
     

    bigdv

    Ultimate Member
    May 17, 2010
    1,297
    Calvert Co.
    So the bolt spring is strong enough to get the 30 cal bullet into battery. I guess it doesn't take that much to mash the 30 cal bullet Into the 22 cal chamber?
     

    Qbeam

    Ultimate Member
    Apr 16, 2008
    6,074
    Georgia
    The forward action of the bolt carrier group pushed by the buffer spring and mass of the buffer could compress/push the bullet back into the casing, and form the brass into the chamber. Touch off the primer and pressure pushes the bullet into the long form you see in the article. Pressure builds up, and is released via the path of least resistance. All in a very short period of time. Lucky no one got hurt.

    Q
     

    bigdv

    Ultimate Member
    May 17, 2010
    1,297
    Calvert Co.
    The forward action of the bolt carrier group pushed by the buffer spring and mass of the buffer could compress/push the bullet back into the casing, and form the brass into the chamber. Touch off the primer and pressure pushes the bullet into the long form you see in the article. Pressure builds up, and is released via the path of least resistance. All in a very short period of time. Lucky no one got hurt.

    Q

    Aha. Good point. Round does not get chambered but rammed back into shell and brass neck gets chambered.
     

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