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.17 hmr case splitting

Discussion in 'Firearms Certificate (FAC) Guns' started by mbison, Sep 1, 2014.

  1. mbison

    mbison Busy Member

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    So I was talking to a chap today and he said he's never had problems with his 17 hmr (savage 93) getting bad brass or split ammo. Now today I took my hmr out for the first time and being the gent I am, cleaned up as many cases as I could recover. I noticed this when I git home!

    [​IMG]

    2 of those are the remington rounds the gent gave me to try, the others are hornady. I didnt see any amongst the CCI I tried.

    It begs the question though, if he isn't getting splits, does this mean there could be something wrong with my gun? It seemed to shoot just fine but it's not a normal occurrence surely.
     
  2. 1961nuffield

    1961nuffield Honorary Member

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    I'd try and find out the chamber dimensions, and then check your chamber size against them, you may have a slightly oversized chamber.

    John
     
  3. harry brown

    harry brown Banned BANNED

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    It's pretty well known that some older batches of HMR ammo cases split. Some say it's due to the neck not being annealed. I doubt very much your chamber is at fault.
     
  4. Elk hunter

    Elk hunter Keyboard Hero

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    It could just be the brass is very thin. It happens with centre fire brass when it has been work to many times on a reloading press.

    Andrew
     
  5. snapperspike

    snapperspike Engaging Member

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    I've banged an AWFUL lot of rounds through my 17hmr, all Hornady I have to say, and never had any problems at all.
    It USED to be reported, but that was quite a while ago.
     
  6. Jackroadkill

    Jackroadkill Donator

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    I've had the same with some Hornady rounds. It seems not to do any harm to the chamber, as far as I can tell.
     
  7. rabbitraider1

    rabbitraider1 Engaging Member

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    I've had tonnes do this, I like to pretend the horrendous fliers are due to it. Takes some of the heat off me ;)
     
  8. gasman

    gasman Up a bit,,,,,,,

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    I thought it would have been a head spacing fault or like been said thin cartridge walls, manufacturing fault or reloaded to many times
     
  9. Jackroadkill

    Jackroadkill Donator

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    Poor manufacturing; the .17hmr isn't reloadable.
     
  10. 1961nuffield

    1961nuffield Honorary Member

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    Try and do a side by side test, with another rifle owner, if the cases split equally in both rifles then the ammo's at fault, if its mainly your rifle then your chamber is slightly large, which could easily be just manufacturing tolerances, if the rifles new then take it back, as the chamber won't shrink!

    John
     
  11. mbison

    mbison Busy Member

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    My rifle isn't new so that isn't an option. That's 5 out of about 70 I fired. I'm gonna keep going and see what happens. The brass on these little guys is wafer thin if I'm honest
     
  12. harry brown

    harry brown Banned BANNED

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    Just search the other forums, there's lots of info. Like I said earlier many believe it's due to the fact the neck cannot be heat treated after the priming powder is in the rim. It's possible you have some of the old stock rounds which were from bad batches. I've never had this problem ...yet.
     
  13. tobys

    tobys Engaging Member

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    Worth checking all HMR rounds before shooting them. You'll likely find some (maybe 1-2%) are already split. Now, I think more split during firing, but obviously defective ones will already be.
    I have a Savage 93 TRR-SR and it splits plenty but shoots just fine. The ones split before shooting are likely to squib or not fire at all due to damp/lost powder.
    Plenty of (sometimes scary) research and info on the web, especially stateside.
     
  14. airarmstx200

    airarmstx200 Well-Known Member

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    its acommon problem im having the same cracks report it to your supplier.
     
  15. vitalich

    vitalich Keyboard Hero

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    i can see two reasons for that,

    1 the chamber is bigger than round (may be of very big shot count on rifle) or it's already deformed
    - try to put some wax in or selfhardening plasticine or whatewer else to get the exact measurments of the chamber after
    2 you have the bolt lockings weared or deformed and your bolt lets to the round to move back during the shot for few mm
     
  16. Old Owl

    Old Owl Newbie

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    Hi Guys,
    The reason they do it is due to the manufacturing process. The HMR is made from necked down .22 WMR brass. As the priming compound is already in the rim of the shell they can't be annealed so the shoulder is brittle and some may have microscopic cracks in them that open up when they are fired.
    This in itself usually is not a problem. The major problem is that the shells can be contaminated by moisture in wet or humid conditions, and caused a partial combustion of the charge, leaving a projectile wedged in the barrel.
    Inexperienced shooters in particular do not notice the difference in the report and re-chamber and fire another round and all hell breaks loose.
    I am currently looking at a customers Ruger m77 that he was lucky to walk away with his eyes and fingers from.
    I have had to dislodge several projectiles from other barrels.
    There was some talk that the makers of the ammo were going to start using nickel cases that don't work harden. That was about five years ago and we haven't seen them yet and the problem persists.
    The moral of this story is, if it don't sound right, have a look down the barrel before trying again.
     
  17. mmamonster

    mmamonster Pro Poster

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    Me and jsb888 took out my 17hmr to zero in new scope a couple of days ago,
    i had about 3 out of 30 that split. They were reminington aswel.
     
  18. gasman

    gasman Up a bit,,,,,,,

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    I had this on Saturday just gone, the second shot from my new t-bolt misfired and left a round up the barrel, and had several spilt case's too :(
     

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