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# Formula for shooting in a cross wind..

#1
01-17-2003, 11:46 AM
 Gold Member Join Date: Jan 2003 Location: Swartz creek Mi Posts: 958
Formula for shooting in a cross wind..

How can I shoot long range with a cross wind?
also, what is the mathamaticl formula.
Thank you" Keith....
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Keith Sage.
#2
01-17-2003, 11:58 AM
 Gold Member Join Date: Mar 2002 Location: mi Posts: 991
Re: Formula for shooting in a cross wind..

Go to JBM http://internet.cybermesa.com/~jbm/b...traj/traj.html
JBM is a free ballistic program.

Crow Mag
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#3
01-20-2003, 08:47 PM
 Platinum Member Join Date: Jan 2003 Location: The rifle range, or archery range or behind the computer in Alaska Posts: 3,275
Re: Formula for shooting in a cross wind..

Keith,

Some math would include:

An example for calculating wind would be like this: 3000’ (range in feet) divided by muzzle velocity (2600) = 1.1538. The real time of flight for STANDARD air density would be (at 1000 yards) 1.7651 using a 168 grain .308 caliber bullet @ 2600 FPS. Then, 10 miles per hour times inches per second (10x17.6)=176.0 Next take the real time of flight and subtract the time of flight as if there was no atmosphere (1.7651-1.1538)=0.6113 This is the delay time, now multiply the delay time by the inches per second (.6113x176)=107.58 inches at 1000 yards.

Its very hard to do it this way if you cant determine the real time of flight in the current air density. That is a whole other subject.
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