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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Effects of Rifle Canting on LR Accuracy
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<blockquote data-quote="Brent" data-source="post: 28655" data-attributes="member: 99"><p>Dave,</p><p></p><p>I understand most of what you are saying, but a few things I'm not sure of. I'll have to read more after I get some coffie.</p><p></p><p>This part here was one that kind of threw me off until I thought about it a little while, I wasn't exactly thinking about it in the way you were at first. </p><p> </p><p><strong>The degree of deviation for a 45 degree inclined fire problem is 1 - .707 or .293. BUT the deviation for a cant problem (as I see it) is greatest at the onset so a 45 degree cant produces a deviation error of .707 not the .293 I had expected.</strong></p><p></p><p>Man am I glad you've worked with angles so much! <img src="http://images/icons/smile.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> I hadn't figured the drop at distance from LOS, cosine of 78 degrees for the simple solution. Thanks Dave! <img src="http://images/icons/smile.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p><strong>For my 308 Win with a 1.75" scope height and 2.7 inches of TOF drop I'll have a 2.225" windage error and a -.6" elevation error.</strong></p><p>For some reason, I'm having a hard time duplicating that, maybe I missed something?</p><p></p><p><strong>The elevation error is the reciprocal of the windage error (I believe) so (276 + 1.76) * .021852 ( 1 minus the cosine of 12 or .978148) for an elevation deviation of about 6.06 inches.</strong></p><p></p><p>That is another one I'm not sure I'm seein completely, then again I ain't awake yet, or been through geometry either. <img src="http://images/icons/grin.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> 6" is more than this program figured so I don't know what to think yet. 1 - the cosine of 12... what is "1" and why are we subtracting the cosine of 12 from it to get the vertical error, that is the part I'm missing, probably some more too. Wish I knew more geometry, I have a feeling I'll figure it out but I'm having a serious brain freeze right now! <img src="http://images/icons/rolleyes.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://images/icons/grin.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://images/icons/smile.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Brent, post: 28655, member: 99"] Dave, I understand most of what you are saying, but a few things I'm not sure of. I'll have to read more after I get some coffie. This part here was one that kind of threw me off until I thought about it a little while, I wasn't exactly thinking about it in the way you were at first. [B]The degree of deviation for a 45 degree inclined fire problem is 1 - .707 or .293. BUT the deviation for a cant problem (as I see it) is greatest at the onset so a 45 degree cant produces a deviation error of .707 not the .293 I had expected.[/B] Man am I glad you've worked with angles so much! [img]images/icons/smile.gif[/img] I hadn't figured the drop at distance from LOS, cosine of 78 degrees for the simple solution. Thanks Dave! [img]images/icons/smile.gif[/img] [B]For my 308 Win with a 1.75" scope height and 2.7 inches of TOF drop I'll have a 2.225" windage error and a -.6" elevation error.[/B] For some reason, I'm having a hard time duplicating that, maybe I missed something? [B]The elevation error is the reciprocal of the windage error (I believe) so (276 + 1.76) * .021852 ( 1 minus the cosine of 12 or .978148) for an elevation deviation of about 6.06 inches.[/B] That is another one I'm not sure I'm seein completely, then again I ain't awake yet, or been through geometry either. [img]images/icons/grin.gif[/img] 6" is more than this program figured so I don't know what to think yet. 1 - the cosine of 12... what is "1" and why are we subtracting the cosine of 12 from it to get the vertical error, that is the part I'm missing, probably some more too. Wish I knew more geometry, I have a feeling I'll figure it out but I'm having a serious brain freeze right now! [img]images/icons/rolleyes.gif[/img] [img]images/icons/grin.gif[/img] [img]images/icons/smile.gif[/img] [/QUOTE]
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