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Thread: Headspace Gauges

  1. #11
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    Dave Manson, at Manson Reamers, also makes a Field gage.

  2. #12
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    Even if the chamber is on the long side, all a reloader has to do is fireform the brass to fit and re-size accordingly. Of course that may mean the ammo can only be used in that rifle
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

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  3. #13
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    Quote Originally Posted by MistWolf View Post
    Even if the chamber is on the long side, all a reloader has to do is fireform the brass to fit and re-size accordingly. Of course that may mean the ammo can only be used in that rifle
    In this day and age, hardly a solution. I would hate to have a pile of ammo, even just a couple of ammo cans worth, that was useable in one rifle only.

  4. #14
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    True

    TANSTAAFL- There Ain't No Such Thing As A Free Lunch
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

  5. #15
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    I do save my brass (with the intent to start reloading in the future). Sounds like I should stick to the no-go gauge. I imagine it would require quite a few rounds before you get past nogo anyways.

    Or I could get both and know that after I pass nogo just start shooting steel-cased until the barrel is trash (since it is probally close to end of life at that point anyways) and then start again.

  6. #16
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    From what I've seen, the no-go gage dimensions are arbitrary and vary from one maker to another. The field gage, which measures 1.4736", is the best option for determining if your headspace is safe. Measure your fire-formed brass to see what your actual headpsace is. I'm willing to bet it will be closer to the minimum, 1.4636"
    Last edited by Eric D.; 03-06-13 at 21:59.
    B.A.S. Mechanical Engineering Technology

  7. #17
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    All I care about is safe/not safe. The rest is just details. There is no practical way to adjust headspace on an AR-15 for the home hobiest other than to test a box full of bolts hoping you will find one that is where you want it. Therefore, I don't mess with go and no-go gauges and stick with a genuine U.S. military field guage.

  8. #18
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    Headspace Gauges

    Quote Originally Posted by trackmagic View Post
    I have a few projects coming up that will require me to remove and install barrels so I have been looking up information on head space gauges. I think I understand most of it, but I still had a few questions. Please correct me if anything I say below is not correct:

    Are No-Go Gauges the same as field gauges?

    Are No-Go Gauges the most important?
    Some headspace gauge dimensions here:
    http://ar15barrels.com/data/headspace.pdf

    Field and Go gauges are most important.
    Randall Rausch
    AR15 Barrel Guru
    California Precision Rifle Club founding member

  9. #19
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    Quote Originally Posted by MistWolf View Post
    Even if the chamber is on the long side, all a reloader has to do is fireform the brass to fit and re-size accordingly. Of course that may mean the ammo can only be used in that rifle
    Not entirely true. If you have factory brass that was fired in an excessive headspace chamber the thinning of the web has already started and can result in a head separation on the first reload firing. The proper way to make ammo for excessive headspace is to neck up virgin brass and then neck back down to set the new shoulder in the proper position.

    Brownells sells headspace gauge sets in .001" increments if you want to know what your exact headspace distance is.

    You can adjust your headspace if you have a bucket full of stripped bolts and some proper measuring tools to pick a bolt that is slightly dimensionally different in the direction you need.

    Advntrjnky

  10. #20
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    I think this is the style of Gauge you are looking for. But this is the field gauge for 5.56mm

    gauge reads
    7799734
    rifle/carbine
    5.56 mm
    gage
    headspace
    1.4730 (max)
    field service
    mfr 19204
    00900723
    Last edited by motorolahamm; 03-22-13 at 19:10.

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