How does variences in bullet weight affect accuracy?

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

  1. esshup

    esshup Well-Known Member

    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

    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

    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

    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

    Jul 29, 2004

    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.