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Shooting on an angle

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Old 01-13-2003, 09:05 PM
Bronze Member
Join Date: Dec 2002
Location: Asuncion, Paraguay
Posts: 39
Re: Shooting on an angle

Calculating a corrected “horizontal range” by multiplying the slant range distance to the target by the cosine of the elevation angle, and using this horizontal distance to determine “drop” is absolutely erroneous!
True drop at any range distance (level or slanted) is almost independent of bore elevation angle. This is because the time of flight to the given distance is almost the same, and gravity, which has the principal effect on drop, has nearly the same amount of time to act on the bullet.
True drop multiplied by [1.0 minus the cosine of the elevation angle] is very nearly the effective correction to the bullet path at any slant range from the target. This correction adds to the original bullet path relative to the reference trajectory, no matter at what distance is the gun zeroed.
BTW, this is exactly the method Michael Eichele has worked above.
BTW, try the difference between this method and the "horizontal distance" one, at long range, and you'll see the diference is huge [img]images/icons/wink.gif[/img]!!
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Old 01-13-2003, 09:11 PM
Platinum Member
Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,515
Re: Shooting on an angle

All I have to say to that is compare the data above against any computer ballistic calculator and see that they are the same. Then try it in the field. [img]images/icons/wink.gif[/img]
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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Old 01-14-2003, 05:54 AM
Bronze Member
Join Date: Dec 2002
Location: Asuncion, Paraguay
Posts: 39
Re: Shooting on an angle

Yup!! Michael is right, I think most people don't realize this because you seldom have 1000+ yds shots with 30º+ angles.
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