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Thread: What is an action truing jig used for ?

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    steamingbill's Tools

    What is an action truing jig used for ?


    What are these things used for ? They popped up in one of my google searches.

    My action truing jig. - Long Range Hunting Online Magazine

    Do they make them to get super accurate centering because the chuck is out of true ?

    Got the impression its something to do with making guns/rifles which I don't know anything about.

    I don't "get it"


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    Toolmaker51 (May 15, 2017)

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    Supporting Member Frank S's Avatar
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    The action truing jig is primarily used in a 4 jaw chuck because you can get it set for true center or off center if need be. the jig will have set screws near both ends that way the center line of the action / chamber of the barrel can be set on true center regardless to the outside shape by being able to hold it however many inches apart the set screws are
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    Toolmaker51 (May 15, 2017)

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    Correct. Few commercial actions are cylindrical, so a jig secures an unwieldy contour, that 2, 3, 4, or 6 jaw chucks can accommodate.
    Accurate long range rifles, are typically bolt actions and being mass-produced, can have some misalignment twixt individual centerlines of receiver, bolt, and perpendicularity of face where barrel abuts receiver. Being part of a system, what appear minuscule details, combine to reduce uncertainties of ignition, internal and external ballistics.
    Achieving MOA [minute of angle] accuracy combines mechanical and human engineering aspects of firearms, and positive dedication of the marksperson.

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