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Can anybody enlighten me on what is the proper way to use a cosine indicator on an inclined shooting situation? Any info will be greatly appreciated. Thank you.
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I perfer a Mildot Master because it does the math for you, this is from
How does it work? One of three ways, but simple..
a. The most accurate method is to input the cosine number into your ballistic software; i.e. Exbal Ballistic Targeting Software or Field Firing Solutions, that runs on either your home PC, Pocket PC or Palm Pilot. This is because the software takes into account the trigonomics of the fact that the bullet will still travel the full distance to target, and maintain a similar time of flight.
b. Method #2, is to multiply the cosine number to your MILRAD or MOA hold for your distance to target as indicated on your data card. For example, if your moa hold for 600 yards is 11 moa, and .87 is indicated by the ACI, you would then multiply .87 X 11moa, and obtain a corrected for gravity distance of 9.57 moa. This is fairly accurate, (Caliber Specific) although not as accurate as utilizing ballistic software. This is called the "Improved Rifleman Method."
c. Method #3, is to multiply the cosine number to your sloped distance. This will deliver the flat line distance to target, or what we call the bottom leg of the triangle.
If you experiment with your ballistic software, you will find that there can be as much as eight (8) MOA difference between method #1 and method #3. Method #1 is the most accurate & preferred method.
Now, adjust the sight elevation knob (come-ups) on your scope, for the "corrected range".