How much does rain affect accuracy?

Discussion in 'Long Range Hunting & Shooting' started by linksmechanic, Oct 14, 2009.

  1. linksmechanic

    linksmechanic Well-Known Member

    Messages:
    668
    Joined:
    Jan 16, 2007
    I guess I've never shot at the range before in the rain. I had 2 guns with me and my accuracy was terrible along with my grouping. If I had to guess I would say that rain would deflect the bullet's path to some degree.
     
  2. Michael Eichele

    Michael Eichele Well-Known Member

    Messages:
    3,829
    Joined:
    Jan 6, 2003
    I am not sure if your post is meant as more of a question or a comment....??

    I suppose lots of water collecting in the flutes of a barrel could change harmonics of the barrel and affect POI and consistency.

    Other than that, I personally have never seen my zero (300 yard) change during a rain storm. I have never detected a POI change in the range at any distance in the rain. Nor any accuracy impacts (abnormal or unexplained major group changes). The only differences I have been able to see are the pressure, humidity and tempratures associated with the storm. So long as I compensated for the current conditions properly, things have been spot on. If anything I shoot a bit better in a slight rain because the air is cool and the sun is hiding. This all but eliminates any mirage and is easier to shoot better groups. A little rain is a good thing (IMHO) where a heavy rain makes visibility difficult and water gets all over your lenses.
     

  3. Varmint Hunter

    Varmint Hunter Well-Known Member

    Messages:
    2,519
    Joined:
    Dec 26, 2001
    I have shot precision rifles an the range many times. The rifle range has a full overhang so the issue of water on the rifle or optics did not present itself. At 200 yds I have never noticed a change in group size or POI which I would attribute to the rain.
     
  4. MontanaRifleman

    MontanaRifleman Well-Known Member

    Messages:
    6,068
    Joined:
    May 21, 2008
    It doesn't....
     
  5. eshell

    eshell Well-Known Member

    Messages:
    177
    Joined:
    Mar 10, 2006
    Agreed.

    I have shot many long range matches in rain, sometimes so bad it's hard to see that target, and not only does it have no effect on my drop, but it's easier to see the wind, and there is no mirage. I've shot some of my best 1,000 yard scores in the rain.
     
  6. trebark

    trebark Well-Known Member

    Messages:
    3,475
    Joined:
    Jan 16, 2008
    eshell - I was at that recent f-class match at Quantico when it poured down rain. I did some of my best shooting at 900 yards in a downpour. At one point I shot a 2" three shot group as the range officer twice called "you hit the spotter"

    for the original poster, rain has little effect on accuracy.
     
  7. Rimfire

    Rimfire Well-Known Member

    Messages:
    479
    Joined:
    Jul 14, 2007

    +1 also as said it makes it easy to read the conditions (wind) and spot trace.