split cases
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Thread: split cases

  1. #1
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    Default split cases

    Hello all, first post.
    Have a CZ 75B that has been flawless for several years.
    Loaned it to friend and he showed me a couple split cases, longitudinally from the mouth.
    Was store bought UMC.
    He noticed the round seemed pretty loose in the chamber.
    Disassembled and cleaned and noticed the rounds do have a measureable amount of side to side play in chamber fully seated.
    Never really tried a round in the chamber before to check how snugly they should be so not quite sure what to think of it.
    I doubt that this gun has had even a thousand rounds through it
    Any thoughts would be appreciated.

  2. #2
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    Contact CZ-USA. My thinking would be either a cracked or over-sized chamber. IME,
    nobody builds them better than CZ, that is a reputation they will probably want to
    protect. When you field strip it the barrel comes out, in the event you have to ship
    the barrel back to them.

  3. #3
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    Make sure you have the correct ammo first. Then you may want to try some different ammo if you feel safe doing so. If the problem persists then contact CZ.
    deputy and Popeye like this.

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  5. #4
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    Rounds should wiggle a tiny bit in the chamber, if not they wouldn't feed/eject properly. When a round is fired the brass expands out to fit the chamber and then contracts back some. Cases can crack for a variety of reasons but with new ammo it could be your chamber like you're thinking or the brass could have been improperly made and is too brittle. Brass gets brittle after being fired and sized several times which is why some people anneal it so it softens back up a little. Do like rivervalley said and try a different brand and see if you get better results. My vote goes for bad ammo being you never had the problem before.
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  6. #5
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    Quote Originally Posted by electriceel View Post
    Hello all, first post.
    Have a CZ 75B that has been flawless for several years.
    Loaned it to friend and he showed me a couple split cases, longitudinally from the mouth.
    Was store bought UMC.
    He noticed the round seemed pretty loose in the chamber.
    Disassembled and cleaned and noticed the rounds do have a measureable amount of side to side play in chamber fully seated.
    Never really tried a round in the chamber before to check how snugly they should be so not quite sure what to think of it.
    I doubt that this gun has had even a thousand rounds through it
    Any thoughts would be appreciated.
    Flawless for several years and 1k rounds. Loaned to a friend and it exhibits problems. Hmmm. Don't think I'd worry until I noticed the same problem when using ammunition other than Remington UMC. Personally, I've had problems with Remington ammunition, especially with their UMC line. I vote for a bad batch of ammo.
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    It is common for brass to split if it is old. The stress needed to hold the bullet will cause the brass to crack. If the bullet is the proper dimension it will expand only enough to release the bullet and eject the brass. Brass may not have been properly annealed during production and was too hard.
    Pressure damage due to "Stall" in a semi-auto will occur in the web or primer pocket.

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