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Accuracy and heavy rain?

This is a discussion on Accuracy and heavy rain? within the Accuracy forums, part of the M14 M1A Forum category; Originally Posted by Faronth From conversations with people who shoot long distance for a living on the Government’s free board, housing, transport, and ammunition program ...


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Old February 16th, 2017, 08:53 PM   #16
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Originally Posted by Faronth View Post
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 random distribution thus… any deflection that did occur over the course of bullet flight pretty 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.
I am with you on that analysis m8 !!!!!

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Old February 17th, 2017, 06:07 AM   #17
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I've also heard it doesn't matter. Since a .308 bullet at the muzzle has in the neighborhood of 2,600 foot pounds of energy I suspect a raindrop won't bother it much.

Goes pretty straight through ballistic gelatin as well:

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Old February 17th, 2017, 06:08 AM   #18
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Do you think putting tread on bullets would prevent hydroplaning? Lol!

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Old February 17th, 2017, 06:53 AM   #19
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Thanks for the discussion. Turns out the 9-shots were grouped in at 1.7". I probably had the wrong ammo for the barrel and chamber combination. I was using 175gr FGMM. Maybe I should have used 168's or 125's instead. Chamber is standard 308 Win, receiver is a Bula XM21, barrel is a Bula 18" all installed in a SAGE.

Come to think of it, I've never really had super accuracy out of 175's at 100. I've had better results at 200.

After thinking and talking to Phil, I suppose that this rifle has a good starting point with only 50 rounds through it so far. I remember how hard it was for me to finally get a rifle to shoot under 1.5" with only 5 rounds.

Tony.

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Old February 17th, 2017, 08:03 AM   #20
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Do you think putting tread on bullets would prevent hydroplaning? Lol!
The formula for computing the minimum speed for tire hydroplaning is 9 times the square root of the tire pressure. Thought maybe you could use that....

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Old February 17th, 2017, 09:38 AM   #21
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I'm reading the experienced shooters saying no effect. Experience wins. Although I wonder how could rain not affect POI? Perhaps beyond calculation with the inconsistent variables involved. I get the idea the chance of a raindrop making contact with 2,800fps forward & sub-second flight time could be small. But that also depends on how hard it is raining right? Maybe one gets no direct contact but another shot hits two droplets? Humidity is a long range variable that gets plugged in. And wind (gaseous) affects left/right POI (there is even a knob for that on the rifle). So how could impact with a downward fluid of perhaps terminal velocity of 20mph not create some additional downward force? Wouldn't the bow cone thingy expend some energy to disperse a droplet, or suffer viscous drag? I presume a change in the bow cone makes a change in the forward flight of the projectile? What if the projectile hits a droplet but not dead center on the left/right axis, a little to the left say. Must lay down, brain hurts...

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Old February 17th, 2017, 10:31 AM   #22
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only time accuracy will improve during a heavy down pour is if you can learn to shoot between the rain drops

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Old February 17th, 2017, 10:35 AM   #23
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I have noticed that my rifle shoots better in the rain and I think it is because it disperses heat better and stays at a more consistent temp. I'm sure if it is raining hard enough the sight picture could definitely cause some serious problems.

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Old February 17th, 2017, 12:13 PM   #24
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I think it was mikem0331 here on this website that explained it. Basically the rain never touches the bullet so it doesn't affect it at all.
Rain is a mental thing that is all. It does affect iron sights sight alignment sight picture...

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Old February 17th, 2017, 12:47 PM   #25
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Quote:
Originally Posted by Samuel Seeley View Post
The formula for computing the minimum speed for tire hydroplaning is 9 times the square root of the tire pressure. Thought maybe you could use that....
Mumbo jumbo I'll just put some random groves in with my hot knife. Lol

On a serious note since in theory the rain doesn't touch the bullet I think you need to factor in atmospheric pressure and humidity into the equation. But I never do that much math. But I guess if your stock is not swollen and soaked we're talking small variables over 1-200 yards . I would make adjustments as I would normally would. If you shoot matches have a wet and dry weather rifle if you shoot a lot of wet matches or use synthetic or laminate stocks. That would decrease wet weather variables. Imho.

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Old February 17th, 2017, 12:48 PM   #26
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I have often thought the same thing. I can see how the rain might deflect a round, but I wonder if it would be as dramatic as hitting a blade of grass. With the velocity I can see it deflecting some, but just how much is the question.

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Old February 17th, 2017, 12:56 PM   #27
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At longer distances there is no way that is doesn't effect it, if a 10 MPH crosswind can move a bullet with just air how can pouring rain not effect it?

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Old February 17th, 2017, 01:00 PM   #28
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I was thinking The Lord may have exempted projectiles from the effects of rain due to having enough other ballistic variables to deal with. I could be wrong.

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Old February 17th, 2017, 03:07 PM   #29
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My head hurts after reading this thread. I'm going to take a nap.

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Old February 17th, 2017, 03:24 PM   #30
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Assuming 10mph wind from 3 o'clock to 9 o'clock, full value wind, at 1000yds. the drift would be to the Left 10 inches, 1moa at 1000yds. Can not prove that the rain drops do not impact on the POI of the bullet, but odds are quite slim that would shift the impact a full 1moa.
Only from my experience shooting in some fairly strong rain storms never had the rain cause me to come out of the X ring, most likely me or misreading the wind, mirage, etc.

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