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Cracked casing

Discussion in 'Firearms Certificate (FAC) Guns' started by rabbitraider1, Dec 19, 2013.

  1. rabbitraider1

    rabbitraider1 Engaging Member

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    Hi guys,
    I went out shooting this afternoon to zero my .17hmr,
    When I went to collect my casings I noted that several of them had cracks straight through the casing,
    I didn't notice anything different about the rounds before or during firing but whilst I was picking up the rifle
    another guy came in who had a round detonate in the breech and damaged his rifle,
    I won't fire anymore from that batch and I will go the the shop I bought the from to let him know,
    but I was wondering if anyone else has had a similar situation?
    Thanks
    Tom
     
  2. Elk hunter

    Elk hunter Keyboard Hero

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    You will fine there is many problems with the hmr rounds. From what I understand it is faulty batches and have also seen damaged rifles from breech explosions and barrel damage.
    As you rightly said, take it back to the shop, can't be to careful.

    Andrew
     
  3. 1961nuffield

    1961nuffield Honorary Member

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    Cracking of cases can be caused if the chamber is oversize or the brass is too hard, best to get it checked.

    John
     
  4. Jackroadkill

    Jackroadkill Donator

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    What ammo was it, and were the brands that you and he were using the same?
     
  5. r10hunter

    r10hunter Honorary Member

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    More than likely faulty annealing on that batch of rounds. The quality control on Rimfire annealing is not as high as on centre fire as rimfire cases not reloaded. If it's just a small crack and not a huge split it should not be a problem.
    Cheers Andy
     
  6. rabbitraider1

    rabbitraider1 Engaging Member

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    He was using cci and I have hornady 17gr, but I'm pretty sure they are made in the same factory, It was about 3/4 of the casing that was cracked.

    On a similar note, do any of you guy's use a bore guide? I was advised off one by most of the shooters I know,
    I got a delrin coated rod to try and minimise any damage to the rifling, but there are a few scratches on the rod so I think it must be scraping along the barrel.

    Thanks for the advice
    Tom
     
  7. Kyska

    Kyska Honorary Member

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    Is this after firing?

    Common with hmr.
     
  8. r10hunter

    r10hunter Honorary Member

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    Found this on line I knew I had read it somewhere.
    This is what hornady have to say.

    "The 17 HMR cases may crack because of the annealing process when they are made. The annealing process is what makes the material brittle or flexible depending on the length of time and degree of the process. This is a precise procedure with any other case that can be reloaded, as we want the case to be hard enough to do the job but soft enough to stand up to several reloads. The 17 HMR case is dispensable and can not be reloaded, therefore the annealing procedure isn't quite as strict as with other cases. When the case cracks, it's because the neck was annealed a little harder than it needed to be, making it more brittle. This does not affect the accuracy or performance of the ammunition. Normally, the fired case will eject the same as any other, and unless they are picked up later, the shooter may never even know they had a case with a split neck. We would prefer that none of the cases split, (and the majority of them don't), but it seems redundant to spend the time and money on perfecting the case when it isn't practical or necessary. Our lab has evaluated cases with cracked necks, and the powder is fine, the case necks are just more brittle."

    The round in the other guys gun sounds as if it failed in another way.
    Maybe the rear of the case next to the rim bursting.
    Cheers Andy
     
  9. rabbitraider1

    rabbitraider1 Engaging Member

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    Ahh thats a relief, I must admit I was almost more worried about it affecting accuracy and wounding something than anything else :p
    I went to the shop today and he did say the other guy's failed at the back of the round so I'm guessing that was due to something else,
    Thanks for the help,
    Tom
     
  10. Whistler

    Whistler Donator

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    Since I've had my 17HMR I've had a number of rounds that have gone off with the usual sound but have failed to push the bullet out of the barrel. That's rounds from Remmington, Hornady and CCI. Luckily its either prevented the next round being pushed home or I've noticed (i.e. WTF did that go ???) and I've investigated. I've been told that shooting another round whilst one is blocking the barrel will cause at best a damaged rifle, at worst a damaged hand. Thank . its not happened to me, its only meant a couple of shots then back home to sort the gun - frustrating but all digits thankfully intact.

    I was given all kinds of reasons by my shop, usually focussed on the rifle itself, but then I read about cracked cases so decided to check mine. Using a magnifying glass, on inspection between 5 - 20 % of the 17HMR rounds I looked at per block of 50 had obvious cracks in the necks (before firing this is). I took them back to the shop and after some discussion ;) we got his stock out on the counter. I don't think he turns his HMR stock over much, some of the batches indicated 2010 which I think was the peak of the problem ? Anyway, I spent a few hours going through the different brands and found some shockers :eek:

    The best of the batches he had were Hornady blue tips, so I sorted out 300 rounds that were not visibly cracked and bought those. So far I've not had one mis-fire, but I've only shot about 100 rounds.

    Now, the shop swear I am the only person that's been back and complained. There's nothing different about my rifle, its a CZ452 "Style", bought brand new (different shop). Maybe some guns are more "sensitive" to these cracked rounds ? Maybe most just result in flyers ? I don't believe it though, a cracked round is surely faulty and potentially dangerous ?

    Whatever, I now would not chamber a 17HMR round I hadn't visually checked for cracks first :)
     
  11. r10hunter

    r10hunter Honorary Member

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    It would surprise me if the squib issue and the cracked case issue were the same problem. I can't see how a crack in the end of the case could cause a squib.
    The squib issue is often that the main powder charge did not get put in the case, only the priming charge in the rim fires leaving the bullet stuck in the barrel.

    You always hear a squib when you fire just a crack instead of a bang.

    Maybe the cracked cases before firing are an indication of some misalignment of the case in the factory's machinery that could have caused the main powder charge to not be correctly inserted???

    If you have any of these rounds that are cracked and you think they would be squibs it would be interesting to accurately weigh them. I know there would be some variation in case weights but you would get an idea if any rounds were more suspect than others.

    Cheers Andy
     
  12. Whistler

    Whistler Donator

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    I don't have any of the cracked rounds unfortunately, I left them all with the RFD. You're right, it would have been interesting to weigh them - that never came up !

    All the "stuck" rounds went off with the usual bang as far as I could tell. Like I said, the only reason I knew there was a problem was not being able to chamber the next round - and once that had happened a few times I started to check the bore if I took a shot and couldn't see where it had hit.
     
  13. sneakysniper

    sneakysniper Donator

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    This was a big problem a while back. The squibs may be frim moisture getting into the powder through the cracks? I havent had any myself yet though.
     

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