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Bubble level for rifle
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<blockquote data-quote="Dave King" data-source="post: 41005" data-attributes="member: 3"><p>Brent</p><p></p><p>I believe I have an answer to how a cant error can be zero as seen in RSI.</p><p></p><p>If the program/shooter uses the "near" zero the error can be zero. This is where the projectile crosses the line-of-sight the first time. The "near" zero is most often though of as something much less than 100 yards, typically by hunters and their rifles/sights it's in the 20 to 30 yard range. (There are methods to move this "near" zero to 100 yards but it requires mounting the scope/sights very high on the rifle. Perhaps this is the possible error I saw in RSI when I changed the sight height to 2.6 on on example.)</p><p></p><p>reference article:</p><p> <a href="http://home.worldonline.nl/~jhogema/kantel01/kantel1e.htm" target="_blank">http://home.worldonline.nl/~jhogema/kantel01/kantel1e.htm</a> </p><p></p><p></p><p>Notice in section 2.1 of the referenced web article the figure B representation. This can be thought of as a "near" zero representation if you discount the projectile path, examine only the Line-Of-Sight line. Cant the rifle 90 degrees to the side and the deflection goes to zero -0-. The "drop" still exists and the round will strike below the POA, <strong>BUT it will be DIRECTLY BELOW the POA</strong>. </p><p></p><p>I believe the more correct approach would be better represented by figure C in section 2.1 of the referenced web page. We seldom use the "near" zero (first LOS crossing) in hunting.</p><p></p><p>Edited for format</p><p></p><p>[ 03-08-2004: Message edited by: Dave King ]</p></blockquote><p></p>
[QUOTE="Dave King, post: 41005, member: 3"] Brent I believe I have an answer to how a cant error can be zero as seen in RSI. If the program/shooter uses the "near" zero the error can be zero. This is where the projectile crosses the line-of-sight the first time. The "near" zero is most often though of as something much less than 100 yards, typically by hunters and their rifles/sights it's in the 20 to 30 yard range. (There are methods to move this "near" zero to 100 yards but it requires mounting the scope/sights very high on the rifle. Perhaps this is the possible error I saw in RSI when I changed the sight height to 2.6 on on example.) reference article: [url="http://home.worldonline.nl/~jhogema/kantel01/kantel1e.htm"]http://home.worldonline.nl/~jhogema/kantel01/kantel1e.htm[/url] Notice in section 2.1 of the referenced web article the figure B representation. This can be thought of as a "near" zero representation if you discount the projectile path, examine only the Line-Of-Sight line. Cant the rifle 90 degrees to the side and the deflection goes to zero -0-. The "drop" still exists and the round will strike below the POA, [B]BUT it will be DIRECTLY BELOW the POA[/B]. I believe the more correct approach would be better represented by figure C in section 2.1 of the referenced web page. We seldom use the "near" zero (first LOS crossing) in hunting. Edited for format [ 03-08-2004: Message edited by: Dave King ] [/QUOTE]
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