The dreaded Carbon Ring

Discussion in 'Rifle Country' started by Nature Boy, Feb 22, 2021.

  1. Nature Boy
    • Contributing Member

    Nature Boy Contributing Member

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    I was cleaning a few rifles this weekend I was able to get some good examples of what a carbon ring looks like so I thought it would be worth a post on the subject.

    When it comes to the subject of carbon rings, some folks may not even know about. Perhaps they have heard about it but don’t know where it is, why they should worry about it or what to do to address it.

    Then there’s a high likelihood that some of you know more than I do about carbon rings and will let me know that I don’t have a clue.

    Regardless, all points of view are welcome.

    The carbon ring I’m referring to develops in the chamber where the case mouth ends, right before the chamfer and transition to the throat

    98B3426A-8EB3-4735-B5DA-5B82FC78B934.jpeg

    Some folks will refer to the carbon ring as any hard carbon deposits that forms from the case mouth through the first few inches of the barrel. I’m focusing specifically on this:

    FECA172C-AF07-45E9-AF16-B7529564F998.jpeg

    I believe that cleaning the chamber is an often overlooked area when it comes to rifle maintenance (I know it has been for me) If not addressed, this carbon deposit will build up to a point where it impinges on the case causing pressure variations and degrading accuracy. Like any hard carbon (not powder fouling) the longer it goes, the more difficult it will be to clean it out.

    As I stated above, I was cleaning a couple of .308s I was able to get some good before and after pics

    6B8B8B07-BF7B-4423-8E76-D0586E880438.jpeg

    98615389-960D-49E0-9DA3-BC2BC0528C7C.jpeg

    The deposits shown formed after around 100 rounds, so it doesn’t take much to start building up.

    There are several effective methods to get at it. A good chamber brush. A patch wrapped on a jag with a bore cleaning compound. An over sized bore bush. Regardless, it requires a combination of mechanical action and cleaning products to remove it. Solvents alone won’t touch it.

    My favorite technique is to use these Ramrodz. In regards to .308 based chambers, the 45 cal size is perfect

    67376610-7FFA-46BC-B2AF-D8D256F4F7DB.jpeg

    I soak the “Q-Tip” with Boretech carbon remover and insert it in the chamber and let it sit in there for an hour or so.

    8D3F43FA-6E86-4902-A87D-D2FBA2F7FBE4.jpeg

    After that, I’ll work the Ramrodz back a forth and spin it until I’ve gotten the deposit completely removed.

    Now, if I let it go for a few hundred rounds this method is less effective. It usually requires a chamber brush and some form of bore cleaning compound like JB, Iosso or Flitz.

    I hope some find this helpful
     
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  2. MechAg94

    MechAg94 Member

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    What do you use to hold the chamber brush? Most cleaning rods are made to rotate and don't let you rotate the brush right. Just curious if y'all have something better you use.
     
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  3. BreechFace

    BreechFace Member

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    Once I started using Bore Tech products it was over, it's all I use now.
     
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  4. Nature Boy
    • Contributing Member

    Nature Boy Contributing Member

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    I have one of these. I think I got it from Brownells for cleaning the chamber on my M1A

    4BC30949-A38E-4960-969E-C27BECA7562F.jpeg

    Dewys makes a short cleaning rod too that would work
     
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  5. LoonWulf
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    LoonWulf Contributing Member

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    I use a 2' long 5/16" brass rod that I drilled and tapped to 8-32 for stuff like that. Got it at ace, cost like 4 bucks.

    Neat pictures, ive never seen thst build up before, but id bet a few of my guns have it bad.
     
  6. Laphroaig

    Laphroaig Member

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    Nice explanation and pictures @Nature Boy. I posted this about a carbon ring that I have:

    https://www.thehighroad.org/index.php?threads/carbon-rings.881279/

    I didn't hardly touch mine with some pretty vigorous cleaning similar to what you did. My solvent of choice was Slip2000 Carbon Killer. I just bought some of the Boretech but haven't tried it yet.
     
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  7. Legionnaire
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    Legionnaire Member

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    Thanks. I posted elsewhere about my experiment forming .30-06 brass into .280 AI brass. The reason it's not a good idea to do on a regular basis is the short neck creates a pronounced gap where you indicate in the first picture. That short neck would exacerbate carbon buildup as well as premature throat erosion.
     
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  8. Walkalong

    Walkalong Moderator Staff Member

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    Yep, and from that thread.
    [​IMG]
    [​IMG]
     
  9. Walkalong

    Walkalong Moderator Staff Member

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    Amen to that. :)
     
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  10. Poper

    Poper Member

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    In my best Arte Johnson imitation: "Velly intelestink!"
    https://tenor.com/view/very-interesting-arte-johnson-listening-gif-14472867
     
  11. d2wing

    d2wing Member

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    Good info thanks.
     
  12. South Prairie Jim

    South Prairie Jim Member

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    @Nature Boy good write up' now I have to go clean more..
     
  13. jwamplerusa

    jwamplerusa Member

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    My wife purchased me a Teslong borescope for Christmas. I spent days cleaning "clean" bores and chambers. The Garand chamber had a nice carbon ring that took quite some time to remove.
     
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