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long range adjustment

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2009 at 22:24
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Optics Apprentice
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Joined: September/19/2009
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I have been wanting to know how to adjust for the wind, humidity, temperature, etc at long distances.  I dont really know what to do as far as learning how, is there a book or something to learn how or do I need to find a person who knows how and get them to teach me. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/22/2009 at 03:30
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Everything starts with your rifle caliber, bullet weight and bullet speed. So for starters you will need to chronograph your bullets.
From there you use a ballistic calculator, many which are available on the web for free. You punch in the numbers such as windspeed, bullet velocity, weight etc and the program will spit out your required adjustment.
You can then either aim off accordingly or dial your scope.
Naturally you need to verify how well your rifle matches the ballistic program by real shooting on the range.
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/22/2009 at 04:00
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There is a book: Bryan Litz' Applied Ballistics for Long Range Shooting - http://www.appliedballisticsllc.com/index_files/Book.htm

It's very well written and easy to follow. It also includes ballistic information from Bryan's own tests on something like 175 popular bullets, including the G7 BC (G7 is a model far more appropriate to a low-drag boat tail projectile). I found his G7 BC for the Nosler 165gr. .30 Accubond was much more accurate than what Nosler lists as its G1 BC. I plugged that into the (free) JBM ballistics calculator and got spot-on results at the range.

You do need to chronograph velocities. The other most important variables as far as calculating trajectories seem to be barometric pressure (make sure you know whether you are using station pressure or corrected pressure) and altitude, followed closely by temperature. Humidity doesn't make much difference. But other factors like correctly inputting your scope height and wind also matter.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/22/2009 at 22:31
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Thanks for the help

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