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.308 Winchester Ballistics

Discussion in 'Rifle Country' started by Timradcliffe345, Dec 3, 2008.

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.308 Winchester for shooting up to 600 yards?

  1. 20" barrel

    4 vote(s)
    20.0%
  2. 24" barrel

    16 vote(s)
    80.0%
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  1. Timradcliffe345

    Timradcliffe345 member

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    What is the difference, ballistically, between a 308 Winchester out of a 20" versus a 24" barrel? I'm planning on shooting out to 500-600 yards. Is there alarge tradeoff going down to a 20" barrel. If not, the 20" is lighter and more compact. Please help me out. Thanks and God Bless the US.
     
  2. Slamfire

    Slamfire Member

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    This is not an exact comparison, but I have data that is close between 18”, 22” and 26” 308 barrels.

    Basically my measurements show about a 25 fps loss/increase per inch of barrel.

    At 600 yards, it all depends on what you want to do. The longer barrel gives extra velocity and I would think that is an advantage a long range.

    PTR91 18" barrel


    150 gr Australian Ball MF83 headstamp

    30 April 2008 T = 75 °F

    Ave Vel = 2599
    Std Dev = 23
    ES = 63
    High = 2630
    Low = 2567
    N = 10

    150 gr Hornady FMJBT 43.0 grs AA2520 wtd Lot 9595 Czech Mixed LC WLR
    OAL 2.785

    30 April 2008 T = 75 °F

    Ave Vel = 2544
    Std Dev = 32
    ES = 84
    High = 2574
    Low = 2490
    N = 5



    Ruger M77 Tactical, 26” Barrel

    150 gr Australian Ball MF83 headstamp

    30 April 2008 T = 62 °F

    Ave Vel = 2819
    Std Dev = 19
    ES = 64
    High = 2859
    Low = 2795
    N = 10



    150 gr Hornady FMJBT 43.5 grs AA2520 wtd Lot 9595 Czech Mixed LC WLR
    OAL 2.785
    30 April 2008 T = 65 °F

    Ave Vel = 2756
    Std Dev = 28
    ES = 97
    High = 2806
    Low = 2709
    N = 10



    M1a 22” Douglas 1:10 barrel

    150 gr Hornady FMJBT 43.5 grs AA2520 wtd Lot 9595 Czech Mixed LC WLR
    OAL 2.785
    18 May 2008 T = 70 °F

    Ave Vel = 2700
    Std Dev = 30
    ES = 85
    High = 2736
    Low = 2651
     
  3. dagger dog

    dagger dog Member

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    I have a side note on the .308 Win. data page in my Speer #13 manual that as a rule of thumb(and I'll probably get shouted down) that you can figure roughly 20fps +-for every 1" of barrel and I think I remember the reference going down to an 18" bbl., but I don't remember the velocity gain for over 26". But I take it as the ammo and bbl has to be the same. In other words the article I read started out with a 26"bbl and actually cut 1" off and recrowned for every test down to 18"
     
  4. doctorxring

    doctorxring Member

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    .

    Difference is around 100 fps.

    This amounts to around 40 yards of ballistic effectiveness.

    If you want to tinker with numbers, this is a good ballistic
    calculator --

    http://www.handloads.com/calc/


    have fun ! dxr

    .
     
  5. Shawnee

    Shawnee member

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    Another important - but unmeasured - difference between a .308 from a 20" barrel and one from a 24" barrel is the noise. The .308 from a 20" barrel is LOUD, and that is not going to help your target shooting.

    :cool:
     
  6. zeke

    zeke Member

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    DSA 16 inch carbine with permanetly attached muzzle break. Makes for a 14 in rifled barrel. Hirtenberger, Port and SA all get very close to 2600 fps, above 60 degrees.
     
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