Effect of rain on accuracy/bullet drop

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brent373

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Hello all,

I cannot help but say that (nearly) everywhere I have looked, in trying to find a reliable answer from someone who has objectively experimented with this, there are only relplies beggining with " I imagine that..." or "You would think that..." or " Aww reccon' rain won't change nuttin".

The effects for all intents and purposes at 100 yds are negligable ( I imagine ;) ) , but how about out past 1000, 1100 yds etc..

Any experience out there ?

thanks
 
You will hit a little higher.

Barometric pressure is lower in bad weather. Less friction from air to the projectile.

How to calculate it? No clue... For me it is a hit and miss thing and a good log book. :D

I will have to look my log books if you want numbers... My experience in bad weather over long distances is limited.


Cheers.
 
The effect of precipitation is just as you have read in the past - negligible. Even its effect on some of the most sensitive projectiles - 22LR rimfires over extended ranges is not worth considering. There are other variables ,including atmospheric, that when combined have a significant effect on flight.
 
It can knock the bullet out several inches.

First you need to find:

Amount of rain drops per sq" / Bullets area per sq" x Velocity of rain drop/ Velocity of bullet / Bullet drop X Ballistic Coef / Elevation x Atmospheric pressure x Temp/ Relative humidty =
 
noneck180 said:
It can knock the bullet out several inches.

First you need to find:

Amount of rain drops per sq" / Bullets area per sq" x Velocity of rain drop/ Velocity of bullet / Bullet drop X Ballistic Coef / Elevation x Atmospheric pressure x Temp/ Relative humidty =
Click to expand...


but never ever ever divide by 0:D
 
noneck180 said:
It can knock the bullet out several inches.

First you need to find:

Amount of rain drops per sq" / Bullets area per sq" x Velocity of rain drop/ Velocity of bullet / Bullet drop X Ballistic Coef / Elevation x Atmospheric pressure x Temp/ Relative humidty =
Click to expand...
Most of the math on the net gives you a low probability of a collision. The other thing is that the airflow around the bullet may disperse raindrops, hard to be sure.
 
Hard to speculate, rain comes in many forms (from a drizzle to a downpour) and is rather inconsistent, specifically the amount of rain that will hit the projectile, calculating bullet trajectories through particle systems is next to impossible as there are way too many variables to calculate, plus they are not static.
 
My experience: I have shot in the rain at distances from 100 yards to 1000 yards. I have never seen an effect that could be attributed to a bullet hitting or being deflected by a rain drop (i.e. a wild "flyer").

If you do the math that @noneck180 suggests, the result is somewhat surprising - basically, even with a very heavy rainfall, the density of water droplets in the air is so low that a bullet hitting a raindrop is incredibly unlikely.

I expect that a bullet hitting a raindrop *would* shift its P.O.I. quite noticeably, possibly even causing a miss of the entire target. I think that my experience and the experience of others that "there's no effect of rain" is basically an observation that you are so statistically unlikely to hit a raindrop that the most reasonable way to plan your shooting is to just carry on.
 
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