# Shooting at angles / angle cosine

Discussion in 'Long Range Hunting & Shooting' started by LaHunter, Sep 27, 2013.

1. ### LaHunterWell-Known Member

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210
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Sep 30, 2012
Can someone that knows explain to me how angle cosine works for shooting angles. What is the math involved. I know there are range finders out there that do the math for you, but I can't spend that kind of money. I have a Leica 1600 that will tell me the sight angle.

EXAMPLE: I am shooting a 'raw' distance of 430 yards at an angle of 35 degrees.
The cosine of 35 degrees is .819 (I have a calculator that knows this).
Do I multiply 430 yards by .819 to get a 'shoot to' distance of 352 yards?

Thanks for educating me on this. I am heading to Big Horns in WY in late October and hopefully I may get to use this info.

2. ### CB11WYOWell-Known Member

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536
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Nov 13, 2012
Yup that's right.

I also believe a slightly more accurate way to calculate the same thing is to take your .819 cosine and multiply it by your BULLET DROP instead of your YARDAGE. But there has to be some pretty long distances and/or some pretty steep angles to notice a large difference between the two methods.

I've found some good stuff on this topic using the "Search" on this site.

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Nov 16, 2012