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Accuracy and heavy rain?

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Old February 16th, 2017, 02:04 PM   #1
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Accuracy and heavy rain?

It's pouring buckets right now. I just got back from the range doing some final testing on a rifle. Accuracy was good, but not as good as I had hoped. 9 rounds in about an inch and a half with a flyer out another inch. I'm wondering if the rain can have a factor in opening up groups.

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Old February 16th, 2017, 02:06 PM   #2
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Were you and the rifle under a shelter or out in the open?

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Old February 16th, 2017, 02:07 PM   #3
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I have often thought about this myself, more questioning accuracy in general. Most often think about this while hunting in the rain, should I stay or just go home. That being said I have taken a couple of deer in moderate rain.


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Old February 16th, 2017, 02:21 PM   #4
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Shooting off a comfortable covered bench.

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Old February 16th, 2017, 02:23 PM   #5
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Shot quite a few long range matches in rain storms and asked the same question one day from experienced shooter and his answer was no the rain did not impact adversely on the accuracy of the bullet in flight. Is that true ? but for me it did not seem to make any difference. In Palma matches the round is leaving the muzzle at something very near 3000fps so very little exposure to the rain drops between muzzle and target face. Just a thought.

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Old February 16th, 2017, 02:42 PM   #6
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Shooting in a heavy downpour with iron sights is not fun, the sight picture is just not the same . For me anyway.

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Old February 16th, 2017, 03:35 PM   #7
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Only if you are using one of those new fangeled bullets that are zigging in stead of zagging around the last rain drop before impact. Were you using right or left twist barrel?

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Old February 16th, 2017, 04:07 PM   #8
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Actually, Tony, it depends on how many rain drops you hit on the way to the target.lol

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Old February 16th, 2017, 04:10 PM   #9
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I guess I think to much, I have thought about this numerous times.

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Old February 16th, 2017, 04:10 PM   #10
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Quote:
Originally Posted by boomerpusher View Post
Actually, Tony, it depends on how many rain drops you hit on the way to the target.lol
That's my thought as well, we have all seen how not accurate a rifle is underwater in the pool.

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Old February 16th, 2017, 04:17 PM   #11
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Shot matches at Malvern, Ohio quite a bit and an early April match no rain, but sleet mixed with rain, miserable but only problem I had was the sleet/ice crystals got stuck in the rear sight aperture. Just blew them out and went on with the match. High Power shooters just flop down their mat in the mud hole and shoot, and bench rest shooters can always be detected by the crease in their trousers, all neat as a pin so to speak. Just a little jab of humor there for the bench rest shooter crowd. I can hear the incoming now but be easy on me for I am old and crippled up these days

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Old February 16th, 2017, 04:30 PM   #12
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I shot one of my tightest 300yd groups in a heavy downpour.

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Old February 16th, 2017, 05:01 PM   #13
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Given how relatively small a raindrop is, is it possible that the the air disturbed in front of the bullet (I have no idea what its called, the opposite of a slipstream, I suppose, and whatever effect the RPMs might have) blows the drop apart or vaporizes it, and the bullet never actually comes in contact with the water? I'm really asking.

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Old February 16th, 2017, 05:04 PM   #14
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I remember fiddling around with some hypothetical numbers about this once upon a time and, as I recall, ended up deciding that the chances of a bullet hitting a raindrop are pretty slim. Watch an airplane flying across the sky at night and notice how few times it actually passes exactly over a star. I don't know what would happen if a bullet really did hit a raindrop--my hunch is that not much would happen--lots of anecdotal evidence here and elsewhere that some fine scores are fired in the rain.

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Old February 16th, 2017, 07:48 PM   #15
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Quote:
Originally Posted by Cowboy2 View Post
Given how relatively small a raindrop is, is it possible that the the air disturbed in front of the bullet (I have no idea what its called, the opposite of a slipstream, I suppose, and whatever effect the RPMs might have) blows the drop apart or vaporizes it, and the bullet never actually comes in contact with the water? I'm really asking.
From conversations with people who shoot long distance for a living on the Government’s free board, housing, transport, and ammunition program that hang out at Ft. Lewis when not traveling on business…

Information from experts:
The bullet itself never contacts the rain drops the bow wave in front of it does. I am thinking that’s the term you were looking for above. These shooters were also not trained for a deflection calc to specifically apply in the rain in the advanced scout sniper courses as it was not deemed necessary.

Educated speculation from me:
On a different note the distribution of rain drops falling from a cloud is pretty much the definition of a random distribution thus… any deflection that did occur over the course of bullet flight pretty much just equal out leaving a nominal effect on accuracy. As for the “falling” effect of the rain drop it would not be an issue either given the relative velocities of the ~horizontal projectile vs the ~ vertical elements in the equation upon bow wave contact.

I am open to being learning something new from those that know better. I think it is an interesting topic.

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Last edited by Faronth; February 16th, 2017 at 10:29 PM.
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