timing barrel

Discussion in 'Gun Project Questions & Gunsmithing' started by 10xsllc, Sep 10, 2019.

  1. 10xsllc

    10xsllc Silver $$ Contributor

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    forgot to time barrel after cutting tenon and threading, have already chambered and set head space. any suggestions in an easy way to fix this
     
  2. Gundoktr

    Gundoktr

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    Why does it need to be timed? Extractor cut? Sights? No easy way, start over
     
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  3. Ggmac

    Ggmac Gold $$ Contributor

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    If say a Springfield style extractor cut , well only one option , ok 2 , start again or cut another extractor cut . But I guess you mean to set current barrel spec engraving or. Barrel bore to 12:00
     
  4. swd

    swd Gold $$ Contributor

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    Just shoot it..
     
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  5. 10xsllc

    10xsllc Silver $$ Contributor

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    just want barrel at 12:00
     
  6. 10xsllc

    10xsllc Silver $$ Contributor

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    good idea
     
  7. DaveTooley

    DaveTooley Silver $$ Contributor

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    Not sure what you mean by timed.
    I've never timed-clocked a barrel in my life and never will if you mean bore alignment. Life's to short.

    Question for you if you're referring to bore alignment.
    You turn and thread the tenon. Then align the bore and "clock" the barrel.
    Then the chamber, and by extension, the case head is not perpendicular to the action and by extension the bolt face.
    That's well crazy.
     
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  8. 10xsllc

    10xsllc Silver $$ Contributor

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    my bore is align I was talking about the high side of the outside of barrel
     
  9. tmwinds

    tmwinds Gold $$ Contributor

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    Why?
     
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  10. ridgeway

    ridgeway Silver $$ Contributor

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    Just shoot it.
     
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  11. Nightraider

    Nightraider

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    Basically you'll need to cut the shoulder until it times up or down then adjust the tenon length and headspace. Unless it's an excessive amount you'll not necessarily be gaining anything.
     
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  12. a6mmbrman

    a6mmbrman Site $$ Sponsor

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    Exactly what Dave said +1
     
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  13. DaveTooley

    DaveTooley Silver $$ Contributor

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    What is your set up and process for establishing the high side. I mainly use Bartlein's and they're never out more than a few thousandths. I've done Obermeyer barrels that were never turned after rifling and they were out .050"+ on the muzzle. Never timed and never made a difference on the target.
    I do OEM precision gas gun barrels and time the gas port to fall in the groove. It's a simple process to move the shoulder forward. Everything else follows that.
    If you have taken the barrel out of whatever your setup is you will not get it back in the same place. Just shoot it.
     
  14. Dusty Stevens

    Dusty Stevens COVFEFE- Thread Derail Crew Gold $$ Contributor

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  15. carlsbad

    carlsbad Lions don't lose sleep over the opinions of sheep. Gold $$ Contributor

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    Is there a problem you want to fix? There are a few barrels out there with a lot of bow in them. Is it a sporter? Are you hitting the stock? If you really do need to fix it, for a real reason, figure out how many degrees you want to rotate it. Call that x degrees. Then take x/360 x 62 thousandths off the shoulder and the tenon surfaces. deepen your chamber by the same amount.

    --Jerry
     
  16. 10xsllc

    10xsllc Silver $$ Contributor

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    thank you I am going to shoot it
     
  17. butchlambert

    butchlambert Site $$ Sponsor

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    Listen to Dave. I've mentioned before, Dave has chambered more barrels than all of us together.
    Jerry, Carlsbad, I've never seen an actual bowed barrel or bowed bore. They may take off at a mild spiral. I've asked barrelmakers if the could bore "machine" a bowed bore. They just chuckle.
     
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  18. dmoran

    dmoran Donovan Moran Silver $$ Contributor

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    My own testing has proven to me that indexing a bore's curvature is effective (particularly at distance/LR).
    With what I call my "spin chassis" (pictured below), I have came to the conclusion, for myself any way, that there is advantages to index/timing a barrel to there unique optimal position(s). For barrels that I haven't or won't spin test to final fit/chamber, at 12-o'clock is my preference.
    Donovan

    [​IMG]

    [​IMG]
     
  19. DaveTooley

    DaveTooley Silver $$ Contributor

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    I have no doubt that the bore moves around some. The amount will vary from manufacturer to manufacturer and rifling process. The manufacturer I'm most familiar with uses a 6" long cutter head with about .0005"-0010" clearance. The barrel has to be be pretty darn straight for that to work. When chambering I indicate in the throat and the muzzle. What happens in between has no affect on where the bullet goes.
    If the bore at the muzzle is concentric with a line that is perpendicular to the barrel shoulder and the same line is concentric in the throat that's about all there is to it.
     
  20. DaveTooley

    DaveTooley Silver $$ Contributor

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    Donovan
     

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