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Thread: anybody have a good barrel length/velocity table for 556?

  1. #11
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    Quote Originally Posted by dbrowne1 View Post
    I'm guessing most of the people who make claims about the "limited" external ballistics of SBRs have never actually tried it. I have a 10.5" LMT that can make well-centered hits all day long on 200 yard steel with both XM193 and 75 gr. Hornady (the latter making VERY well centered hits) using an Aimpoint Micro or irons. It actually shoots better than my 16" Colt. It's 80%+ on the 300 yard plate, and the misses are probably my eyesight and not the gun. The plates are about 12x18 inches, the 300 is a bit bigger.
    People are not saying that you can't hit something at 200-300 meters with a 10.5" SBR. They're saying the bullets fragmentation (thus terminal ballistics and wounding potential) will be virtually non-existant at that range with a 10.5" barrel due to the loss of velocity. This is different than just punching holes in paper or making steel clang.

    Regarding the OP's original question...I think a 12ish inch SBR is a good compromise. Still short, but better terminal performance. I personally have a 10.5" SBR in 5.56mm. It's completely reliable with everything I"ve put through it, both with and without silencer attached. I've put ~600 rounds through it, everything from Wolf to Hornady 5.56 TAP. No issues at all so far.
    Last edited by Stan_TheGunNut; 10-10-09 at 00:43.

  2. #12
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    A friend of mine, TimP, was clanging the 472yd steel with his 10.5 LMT in New Mexico back in Nov, 2007 with a Meopta K-dot @ 4x. So I know it can be done if you know your weapon.
    Last edited by KellyTTE; 10-10-09 at 02:23.
    Kelly H
    Yes, I know. No, I won't tell you.

  3. #13
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    No I have actually heard people say that you can't hit targets at that distance.

    I wouldn't want to take that bet about the wounding potential.

    Quote Originally Posted by Stan_TheGunNut View Post
    People are not saying that you can't hit something at 200-300 meters with a 10.5" SBR. They're saying the bullets fragmentation (thus terminal ballistics and wounding potential) will be virtually non-existant at that range with a 10.5" barrel due to the loss of velocity. This is different than just punching holes in paper or making steel clang.

    Regarding the OP's original question...I think a 12ish inch SBR is a good compromise. Still short, but better terminal performance. I personally have a 10.5" SBR in 5.56mm. It's completely reliable with everything I"ve put through it, both with and without silencer attached. I've put ~600 rounds through it, everything from Wolf to Hornady 5.56 TAP. No issues at all so far.
    Last edited by Iraqgunz; 10-11-09 at 01:15.



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  4. #14
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    Quote Originally Posted by Stan_TheGunNut View Post
    People are not saying that you can't hit something at 200-300 meters with a 10.5" SBR. They're saying the bullets fragmentation (thus terminal ballistics and wounding potential) will be virtually non-existant at that range with a 10.5" barrel due to the loss of velocity. This is different than just punching holes in paper or making steel clang.
    Yes, I know that. Terminal effect is not what I am referring to. As Iraqgunz said above, many people do believe that shorter barrels lack "accuracy" or external ballistics to hit targets at 200+ meters.

  5. #15
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    10.5

    I am currently on deployment. The only two guys in my platoon that go out with anything longer than 10.5" MK-18s are the snipers. (Mine has the new DD MK-18 FF rails, and a Noveske barrel. Yes I'm "cheating to defeat the enemy" Thanks JOHN). It is mission specific and my unit is doing urban and suburban DA. It does and is doing the job every day, or should I say night. The 77gr ammo helps, and my rifle shoots sub MOA.
    It may not be "optimal" but the 10.5s are no shit doing the job. Not theory, range, or third hand, but doing it right now....tonight.
    Hope you are all doing great. Other than missing my little ones, I'm having a good time.
    Last edited by Eric Torres; 11-15-09 at 04:02. Reason: More info
    Eric Torres

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