How does variences in bullet weight affect accuracy?

Discussion in 'Reloading' started by esshup, Aug 26, 2008.

  1. esshup

    esshup Well-Known Member

    Messages:
    608
    Joined:
    Mar 23, 2008
    Just for the heck of it, I decided to sort a batch of bullets by weight. In a 130 grain bullet I have weights from 129.5g to 130.1g.

    I sorted by .1g increments.

    In a hunting rifle that is capable of shooting 3/8 moa, should I only load/shoot in increments of .1g, or is a larger weight variance not that detremental to accuracy?
     
  2. royinidaho

    royinidaho Writers Guild

    Messages:
    8,853
    Joined:
    Jan 20, 2004
    There's pills for that condition.:D

    I don't know that there is that much difference.

    However, as someone recently posted any thing you do to increase consistency sure can't hurt.

    It's as with that beach Vball chick w/the tape. If it helps the mind it helps. Good counsel..
     

  3. EddieHarren

    EddieHarren Well-Known Member

    Messages:
    1,046
    Joined:
    Nov 27, 2005
    I have shot bullets, of the same ogive, in weights varying as much as 3 gr., into the same group with my LV bench rifle. Example: 6mm, 7 ogive bullets weighing 65, 66 and 68 gr.
     
  4. esshup

    esshup Well-Known Member

    Messages:
    608
    Joined:
    Mar 23, 2008

    Guys, thanks for the info. I agree that "mind over matter" does work to some degree. On the other hand, I'm a lazy guy and I don't particularly like working for 0 gain.;)

    With time running short before leaving on the trip, I have enough to practice and hunt with one weight, but I will try shooting some from both ends of the weights at distance to see if there is any noticeable variance in group size, especially height.
     
  5. J E Custom

    J E Custom Well-Known Member

    Messages:
    7,307
    Joined:
    Jul 29, 2004
    Esshup;

    Most will agree that it doesen't make much difference at normal ranges,
    but at long range it can have an effect.

    The best way to see the difference is with a chronograph but you have to
    know when the light bullet is fired and when the heavy one is used.

    It is a small % but could make a difference, It normaly works out to be a %
    of bullet weight to % of velocity.(Example) A 200gr bullet that weighs 201gr
    would slow velocity by about 1/2 of a % with every thing else being equal.

    If I were trying to shoot the best group or shoot very long range with a rifle
    I would weight sort the bullets,the brass,and weigh each powder charge to
    the exact sameweight.But for most hunting 400yrds and under It wont make
    that much difference.

    J E CUSTOM