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Thread: 6.5CM both SA/bolt questions

  1. #1
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    6.5CM both SA/bolt questions

    Hi. I am trying to decide on what I want for my AR10 lower to be built at. I would like to make a 6.5CM AR10 for ammo commonality with my 6.5CM bolt gun that I want to build, but I am starting to second guess that strategy.

    When I am going to load for my bolt gun, I am guessing that my COAL will be longer for the bolt gun just from the nature of having more space in the magazine, and if those don't fit in a Magpul AR10 mag, then I would have to load two different cartridges anyways.

    Is there someone out there that loads for a bolt gun that can also use the same OAL so it fits in an AR10 magazine, but doesn't see that much reduction in their bolt gun usage? Is what I am a valid reason to want two different cartridges for my AR10 and bolt gun, or am I making a mountain out of a mole hill?
    Quote Originally Posted by Coal Dragger View Post
    Marines love CLP. Chow, libo, pussy.

    Beyond that everything else is a crap shoot.

  2. #2
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    COAL/mag length is going to be the same with most all common, popular bolt guns (Tikka/Ruger/etc) as the AR platform gas guns.
    From memory 2.180 is about max for both gas guns and bolt guns.
    Last edited by gaijin; 05-08-18 at 20:04.

  3. #3
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    You arent going to like the loads from the bolt gun in the gas gun anyway.

    Gas guns dont seem to like the 140-143 stuff like the bolt guns do. They do better with the 120-123 stuff.

    BUT if you want a longer magazine the KAC and Larue SR25 pattern mags are longer than the Magpul stuff.

  4. #4
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    Same load (41.5 gr R16/140 gr. Hornady ELD-M, CCI BR2, Hornady brass) from 22" Aero 6.5 CM, M-5E1 "AR10" and 24" Howa chassis bolt gun. COAL 2.810" (I had COAL number transposed above- going from memory).
    Velocity is 2740 for 24" bolt gun, 2725 from gas gun- losing 15 FPS for the 2" shorter barrel of gas gun.
    (Black squares are 3/4" X 3/4")

    Aero gas gun:



    Howa bolt gun:


  5. #5
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    Just as a point of reference to what the lighter bullets do in gas guns.

    Im pushing 123g AMAX with Varget(39.9g if I am not mistaken) to 2900fps out of my 22" JP barrel.

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