What are the chances...

Discussion in 'Sako Long/Magnum Actions' started by lord frith, Nov 22, 2020.

  1. lord frith

    lord frith Well-Known Member

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    ...of a .375 AV barrel from 1986 screwing onto a 1984 AV receiver and have everything line up and headspace? I keep reading of bolt switches between rifles and having them headspace correctly, so it was only a short step from there to my question.
    Eh?

    Stephen

     

  2. sraaw

    sraaw Well-Known Member

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    I have been able to swap bolts between L46 rifles and screw a .17 barrel from an AI onto a L46 action with headspacing staying within specification.
    Also have swapped bolts between a AII and L579 without needing to adjust headspacing.
    As such I believe it would be worthwhile checking to see.
    There is a risk the barrel indexing might not line up when the barrel is swapped between actions but you won't know unless you give it a go......
     
  3. paulsonconstruction

    paulsonconstruction Sako-addicted

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    Beings headspace tolerance is .004" the chances of another barrel screwing in without issues is remote. The chances of it screwing in and being indexed where the stampings & extractor relief are lined up properly is near impossible. It's not that big of a deal to have a smith index & headspace it, so your concern is inconsequential. Bolt changes you can luck out with. Barrel changes are a different animal. If you try it, let us know!!
     
    Last edited: Nov 23, 2020
  4. lord frith

    lord frith Well-Known Member

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    Will be doing this swap tomorrow, and will scribe a post mortem.

    Stephen
     
  5. lord frith

    lord frith Well-Known Member

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    Pulled old, screwed new on and need .0078" for sight index. Will be finished tomorrow.
    Stephen
     
  6. lord frith

    lord frith Well-Known Member

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    Just picked the newly barreled action. My friend/gunsmith indicated removing .0075" from the barrel shoulder allowed him to index sights and headspace without touching the breech. Very pleased with how quickly all this transpired.
    Forty-eight or so hours, not too bad.
    Stephen
     
  7. paulsonconstruction

    paulsonconstruction Sako-addicted

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    So, your saying that when the sights indexed the headspace was also within spec & no chamber reaming was needed?
     
  8. lord frith

    lord frith Well-Known Member

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    Apparently the chamber was not touched. The breech was not machined, the 375 stamp and bluing intact. Pretty cool, eh? I did stick a fired case in the chamber and all seemed good with bolt, extraction, and ejection.
    Stephen
     
  9. paulsonconstruction

    paulsonconstruction Sako-addicted

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    Phenomenal!!!! Would have never guess that could happen. That's a matter of the screw threads starting in almost the exact same place on the receiver, the face of the barrel being machined the same, the bolt recesses being the same & the bolt being the exact same length. Sako just made my jaw drop!!
     
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  10. lord frith

    lord frith Well-Known Member

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    PC,
    Mine too. When I bought the AV and discovered a bulged barrel my thoughts immediately slipped into the pond of despair. Where and am I going to find another .375 Sako barrel? Did usual searches of barrel makers, and was in the "checkout" line when, on a simple fluke, I gave Gunbroker a look. Stunned to find a Sako .375 barrel in Alaska and purchased same a few days later.
    Screwing a barrel from a year later than the action on and having all index was not in my thinking at this time. I understand machining and most of what is required to re-barrel, and only on the 15 minute trip to my GS friend's home did I slightly entertain a vision of what occurred actually passing muster. Well, it did, and now you all have the denouement.
    Thanks all for reading and or commenting.
    Stephen
     

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