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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
need help with bullet drop calculation
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<blockquote data-quote="royinidaho" data-source="post: 443119" data-attributes="member: 2011"><p>To get a little more than just in the ball park a piece of information is needed.</p><p></p><p>This data would be the distance in inches between the line of bore and line of sight.</p><p></p><p>To get this:</p><p></p><ol> <li data-xf-list-type="ol">measure the diameter of the scope end bell at the end.</li> <li data-xf-list-type="ol">measure the diameter of the barrel at the end of the scope end bell.</li> <li data-xf-list-type="ol">measure the distance between the top of the end bell and the bottom of the barrel at the end of the end bell.</li> <li data-xf-list-type="ol">Subtract 1/2 of end bell diameter AND 1/2 of the barrel diameter from the top of end bell to bottom of barrel measurement.</li> </ol><p>This will give you the line of sight about the line of bore distance, fairly close.</p><p></p><p>Finally go here and punch in your data. In short order you'll have your numbers. <a href="http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi" target="_blank">JBM - Calculations - Trajectory</a></p></blockquote><p></p>
[QUOTE="royinidaho, post: 443119, member: 2011"] To get a little more than just in the ball park a piece of information is needed. This data would be the distance in inches between the line of bore and line of sight. To get this: [LIST=1] [*]measure the diameter of the scope end bell at the end. [*]measure the diameter of the barrel at the end of the scope end bell. [*]measure the distance between the top of the end bell and the bottom of the barrel at the end of the end bell. [*]Subtract 1/2 of end bell diameter AND 1/2 of the barrel diameter from the top of end bell to bottom of barrel measurement. [/LIST] This will give you the line of sight about the line of bore distance, fairly close. Finally go here and punch in your data. In short order you'll have your numbers. [url=http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi]JBM - Calculations - Trajectory[/url] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
need help with bullet drop calculation
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