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Trajectory vs. Humidity

 
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  #8  
Old 06-27-2003, 09:34 PM
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Re: Trajectory vs. Humidity

Yes, not much to do with trajactory. In fact most times less than 2% of your final calculation. [img]images/icons/smile.gif[/img]
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  #9  
Old 06-27-2003, 11:27 PM
700 700 is offline
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Re: Trajectory vs. Humidity

Increasing temperature makes a bullet plot higher.
Increasing humidity makes a bullet plot lower.

Rgds

700
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  #10  
Old 06-28-2003, 12:04 AM
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Re: Trajectory vs. Humidity

Lets talk 100% humidity. What about shooting 1000yd. in the rain? Ive got a shoot day after tomorrow and the forcast is rain so Im a tad curious.
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  #11  
Old 06-29-2003, 06:16 AM
MAX MAX is offline
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Re: Trajectory vs. Humidity

I think in the rain you have to calculate the Relative Air index. Kinda the reverse of my question. [img]images/icons/rolleyes.gif[/img] Big drops or small? [img]images/icons/grin.gif[/img]

On a more serious note I've heard from some folks that rain doesn't affect accuracy...a hypothesis I find vastly amusing. I've read two articles on the subject that were based on both simulated and actual rain. In the Sim. evaluation which had fall rates on the order of 1"/hour it increased dispersion on the order of 3-5 times with a 7mm bullet as I recall. The actual rain test was with light showers to drizzle and and had no measurable influence at 100 yards.
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  #12  
Old 06-29-2003, 12:12 PM
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Re: Trajectory vs. Humidity

The only effect I have seen in rain, is accuracy detieration. Really no change in elevation setting. [img]images/icons/smile.gif[/img]
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  #13  
Old 06-29-2003, 03:13 PM
 
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Re: Trajectory vs. Humidity

I would agree with the first point Charles made. I have shot thousands of rounds in rain conditions at long range and have noticed a couple of patterns:

1) Very little accuracy degradation in very light rain.

2) Shots do not hit high in medium to heavy rain, like never happens. They tend to hit low by 1/4 to 1/2 MOA at 600 yards.

3) The vertical component of wind drift is greater on left to right winds in the rain, and less on right to left winds.

4) The horizontal component of wind drift is minimized some what from what it appears relative to no rain conditions.
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  #14  
Old 06-30-2003, 06:19 AM
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Re: Trajectory vs. Humidity

Max
I use the JBM program. I have shot in the rain and have shot some good groups.
Crow Mag
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