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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Canting - the right answer
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<blockquote data-quote="JBM" data-source="post: 109799" data-attributes="member: 1969"><p>[ QUOTE ]</p><p></p><p>...I'm failing to understand the differences here.... your own program gives 57" if everything is set to 1000 /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/smile.gif</p><p></p><p></p><p>[/ QUOTE ]</p><p></p><p>Check the "Drop and Windage Relative to Target", zero at 100 yards and see what you get.</p><p></p><p>[ QUOTE ]</p><p></p><p>...I suspect the answer will lie in the different coord sytems you refer to....which I'm not understanding at all [I'm sorry to say, I couldn't fathom what the pdf was showing]! ....grateful if you'd explain them. /ubbthreads/images/graemlins/smile.gif </p><p></p><p></p><p>[/ QUOTE ]</p><p></p><p>Think about it this way, if I tilt my rifle to the right 90 degrees, ALL the drop becomes windage in my scope. As an example, if I my elevation angle is zero (just to make it simple), and I have a 90 degree cant, my 300" drop (made up number) becomes 300 inches of windage in my scope. It's still 300" of drop at the target -- I didn't miss the target by 300" to the right.</p><p></p><p>Take a look at my PDF. The tilted cross represent the scope crosshairs, the untilted ones represent an uncanted scope (the same as the target coordinate system). Notice that the windage of the impact point is greater than the windage in the untilted coordinates. The drop is almost the same. The more drop you have the greater the discrepancy. If you don't have any drop the differences between the two coordinate systems is small (maybe even negligible).</p><p></p><p>I hope this helps.</p><p></p><p>JBM</p></blockquote><p></p>
[QUOTE="JBM, post: 109799, member: 1969"] [ QUOTE ] ...I'm failing to understand the differences here.... your own program gives 57" if everything is set to 1000 [img]/ubbthreads/images/graemlins/confused.gif[/img] [img]/ubbthreads/images/graemlins/smile.gif[/img] [/ QUOTE ] Check the "Drop and Windage Relative to Target", zero at 100 yards and see what you get. [ QUOTE ] ...I suspect the answer will lie in the different coord sytems you refer to....which I'm not understanding at all [I'm sorry to say, I couldn't fathom what the pdf was showing]! ....grateful if you'd explain them. [img]/ubbthreads/images/graemlins/smile.gif[/img] [/ QUOTE ] Think about it this way, if I tilt my rifle to the right 90 degrees, ALL the drop becomes windage in my scope. As an example, if I my elevation angle is zero (just to make it simple), and I have a 90 degree cant, my 300" drop (made up number) becomes 300 inches of windage in my scope. It's still 300" of drop at the target -- I didn't miss the target by 300" to the right. Take a look at my PDF. The tilted cross represent the scope crosshairs, the untilted ones represent an uncanted scope (the same as the target coordinate system). Notice that the windage of the impact point is greater than the windage in the untilted coordinates. The drop is almost the same. The more drop you have the greater the discrepancy. If you don't have any drop the differences between the two coordinate systems is small (maybe even negligible). I hope this helps. JBM [/QUOTE]
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Canting - the right answer
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