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Barrel length vs velocity 28" to 16.5" .308

Discussion in 'Rifle & Shotgun Discussion' started by swampratt, Mar 16, 2017.

  1. NikatKimber

    NikatKimber Moderator Staff Member Moderator

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    Agreed, with a minor exception. They CAN BE more PRECISE. Accuracy denotes how close the group is to the intended target. So a longer barrel (if it generates more velocity - depends on load and cartridge) will be inherently more accurate, as it will have less drop and be less affected by wind. However, lack of accuracy can be accounted for (adjust sighting system) - lack of precision cannot.

    Like most things gun related (or actually, pretty much anything at all) everything is a compromise. It's not as simple as "longer barrel = worse".

    Here's another site that does a similar experiment:
    http://www.ballisticsbytheinch.com/
     
    Last edited: Mar 20, 2017
  2. beastep

    beastep Sharpshooter

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    I agree mostly.
     
  3. NikatKimber

    NikatKimber Moderator Staff Member Moderator

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    What do you disagree with?
     
  4. beastep

    beastep Sharpshooter

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    I dont consider bullet drop a factor in accuracy.
     
  5. NikatKimber

    NikatKimber Moderator Staff Member Moderator

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    But it technically is. It's not a factor in precision, but it IS a factor in accuracy.

    If you used a laser down the barrel of a rifle, that point would be "point of aim" for the barrel. The more accurate barrel is the one with less drop/windage.
     
  6. beastep

    beastep Sharpshooter

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    Which is more accurate, a .308 that will shoot .5moa all the way to 1000yds but has a drop of 400" or a 300WM that shoots 2moa all the way out to 1000yds but only has 300" of drop?
     
  7. NikatKimber

    NikatKimber Moderator Staff Member Moderator

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    The .300 WM is more ACCURATE. The .308 Win is more PRECISE.

    Lack of accuracy can be accounted for (adjust your scope), lack of precision cannot. The .5MOA gun will always be more precise than the 2MOA gun (ignoring any modifications to the gun).

    https://www.ncsu.edu/labwrite/Experimental Design/accuracyprecision.htm

    But you are correct in that given the choice, a shooter would be willing to give up velocity (inherent accuracy - more drop/windage) in trade for more precision (tighter groups).

    My point originally is that shorter does not automatically mean tighter groups. It can; and especially for thinner barrel profiles usually will - but it is not a guarantee for better precision.
     
    Last edited: Mar 20, 2017
  8. beastep

    beastep Sharpshooter

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    I agree with the shorter does not automatically mean tighter groups. We will just have to agree to disagree on the rest.
     
  9. Buzzgun

    Buzzgun Sharpshooter

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    This info is from Charlie Sisk of Sisk Rifles........he is a VERY well respected rifle builder.

     
  10. beastep

    beastep Sharpshooter

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    Very good info.
     

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