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headspace

Discussion in 'Rifle Discussion' started by juggaloxxl, Jan 16, 2011.

  1. juggaloxxl

    juggaloxxl roseburg New Member

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    my mauser 98 with the no go headspace gauge the bolt will close and the bolt will turn halfway to lock is it time for a new barel or is there another way to fix it?
     
  2. chainsaw

    chainsaw East side of Or. Active Member

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    Depends on how far "out"it is.Put 2 layers of scotch tape on the bolt end of the gage,and try again.If the bolt won't close,shoot the gun.If it does close on it,take it to a gunsmith and have the gun fixed.New barrel not nessisarily required.
     
  3. HollisOR

    HollisOR Rural OR, South of Dallas Active Member

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    With a no go gauge the bolt should not close all the way. Partial closer is OK. If it almost closes than it is almost time. If it closes all the way, it is unsafe.

    Chainsaw, the tape is for a go gauge, it is also not 100 reliable. Adding tape to a no go gauge will only give a false reading.

    Other indicators is a sticky, bolt, on firing the bolt seems stuck. One can also inspect the case.

    In all this situations it is wise to consult a competent gunsmith. In text it is easy to misread or misinterpret.
     
  4. madcratebuilder

    madcratebuilder Ardenwald, OR Well-Known Member

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    +1, if you can only turn the bolt part way, not to complete lock you are within spec. Many of the mil-surps are still safe to shoot when closed on a NO GO gauge. If it closes on a FIELD gauge don't shoot it.

    Read this.

    http://hybrid.ualr.edu/satu/headspace.html
     
  5. bcp

    bcp SW WA Member

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    "NO-GO" is maximum for a new barrel, bolt, etc. "FIELD" is maximum for rifles that have been used, a "in the field" check to see if they are worn out yet.

    Bruce
     
  6. BSG 75

    BSG 75 Oregon Well-Known Member

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    As stated, use a FIELD gauge to determine if it is safe to fire.
     
  7. MountainBear

    MountainBear Sweet Home, OR Well-Known Member

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    If the bolt closes on the no-go and field guages, the fix is as follows (and the complexity should convince people that a gunsmith might be the best option).

    First, it must be determined how out of headspace the gun is. Once that number is determined, the barrels is removed. One to several threads worth of the threaded barrel shank are removed, in order to maintain the indexing for the sights. More length than the over-sized headspace is removed. The barrel then has the chamber punched back out to the proper headspace and the barrel is re-installed. If too many threads have to be removed, then there will be insufficient torque shoulder (both interior and exterior in the case of the Mauser) and a completely new barrel is required...