Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Hunting
Long Range Hunting & Shooting
Slope angle shooting at Long Range.
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Michael Eichele" data-source="post: 320079" data-attributes="member: 1007"><p>I cannot speak for other calculator solutions but both of my calculator solutions are as follows:</p><p></p><p>I use the cosine of the degree * Pi / 180 * true drop at range (from a level bore) - the corrected drop from zero.</p><p></p><p>This finds the inches of drop at the line of sight range.</p><p></p><p>So the cosine of 30 degrees is .15 * PI / 180 = .866</p><p></p><p>Take .866 and multiply this by the drop at line of sight range from a level bore. For my favorite load that is 187" at 800 yards even though my impact will be 124" due to a 300 yard zero. For now we are only concerned with the true drop from a level bore.</p><p></p><p>187" * .866 = 162". Now deduct 162" from 187" = 25". Now deduct 25" from your drop at line of sight from your corrected for zero impact of 124". This equals 99" of drop from zero at 800 yards.</p><p></p><p>As far as finding the MOA for correction you can take 99" / click value in inches / number of clicks to make 1 MOA.</p><p></p><p>So for a standard .25 MOA scope one click = .26175" * 8 (which is yardage / 100) = 2.094" per click at 800 yards / 4 (4 clicks per 1 MOA) This = 11.82 MOA where as a level shot would be 124" or 14.8 MOA</p><p></p><p>Like I said, I cannot vouch for how exbal, RSI, Sierra etc.....arrive at the numbers that they do. However my programs and other program solutions match very very closely.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 320079, member: 1007"] I cannot speak for other calculator solutions but both of my calculator solutions are as follows: I use the cosine of the degree * Pi / 180 * true drop at range (from a level bore) - the corrected drop from zero. This finds the inches of drop at the line of sight range. So the cosine of 30 degrees is .15 * PI / 180 = .866 Take .866 and multiply this by the drop at line of sight range from a level bore. For my favorite load that is 187" at 800 yards even though my impact will be 124" due to a 300 yard zero. For now we are only concerned with the true drop from a level bore. 187" * .866 = 162". Now deduct 162" from 187" = 25". Now deduct 25" from your drop at line of sight from your corrected for zero impact of 124". This equals 99" of drop from zero at 800 yards. As far as finding the MOA for correction you can take 99" / click value in inches / number of clicks to make 1 MOA. So for a standard .25 MOA scope one click = .26175" * 8 (which is yardage / 100) = 2.094" per click at 800 yards / 4 (4 clicks per 1 MOA) This = 11.82 MOA where as a level shot would be 124" or 14.8 MOA Like I said, I cannot vouch for how exbal, RSI, Sierra etc.....arrive at the numbers that they do. However my programs and other program solutions match very very closely. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Long Range Hunting & Shooting
Slope angle shooting at Long Range.
Top