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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Technical question for all of you who know what you are doing
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<blockquote data-quote="Bart B" data-source="post: 657045" data-attributes="member: 5302"><p>With three different units for click values on rifle scopes, and none of them are typically exact, one's better off to measure what their scope really moves the reticule per click as well as what gradient lines or dots are spaced at. Plus, all the same scopes of a given make and model will have slightly different amounts of movememt per click as well as the distance between gradient lines or dots have. That's 'cause all the lenses in a scope's optical system focusing the image on the reticule don't have exactly the same focal length. It's very normal for them to have a 4 to 5 percent spread.</p><p></p><p>Don't shoot groups at different scope settings; that's not good enough. Instead, clamp your scope in something with it aimed at a ruler exactly 50 or 100 yards away from its front end, moving the adjustments put the reticule on an inch mark then move the adjustment enough to cause the reticule to move exactly 10 inches on the ruler. Divide 10 by the number of clicks it took to move the reticule 10 inches. If it's 36 clicks, each click's worth .2778 inch. If 42 clicks, each click's worth .2381 inch. Compare that with what the scope's specs say it should be.</p><p></p><p>By the same method, measure how far apart the gradient marks or dots are. Do the same type of math. Then you'll know for sure.</p><p></p><p>If you want to see how the reticule moves in angular MOA's, set the ruler at 95 yards 17.5 inches. One inch will equal one angular MOA at that range.</p><p></p><p>Note that with some scopes, one MOA's meant to be 1 inch at 100 yards; the original and standard for the shooting sports. On others, it's meant to be 1.0472 inch, or what an angular MOA is and has been the spec on some makes and models. Some makes of scopes are not real clear as to which standard they use. Measure what your scope does then you'll know.</p></blockquote><p></p>
[QUOTE="Bart B, post: 657045, member: 5302"] With three different units for click values on rifle scopes, and none of them are typically exact, one's better off to measure what their scope really moves the reticule per click as well as what gradient lines or dots are spaced at. Plus, all the same scopes of a given make and model will have slightly different amounts of movememt per click as well as the distance between gradient lines or dots have. That's 'cause all the lenses in a scope's optical system focusing the image on the reticule don't have exactly the same focal length. It's very normal for them to have a 4 to 5 percent spread. Don't shoot groups at different scope settings; that's not good enough. Instead, clamp your scope in something with it aimed at a ruler exactly 50 or 100 yards away from its front end, moving the adjustments put the reticule on an inch mark then move the adjustment enough to cause the reticule to move exactly 10 inches on the ruler. Divide 10 by the number of clicks it took to move the reticule 10 inches. If it's 36 clicks, each click's worth .2778 inch. If 42 clicks, each click's worth .2381 inch. Compare that with what the scope's specs say it should be. By the same method, measure how far apart the gradient marks or dots are. Do the same type of math. Then you'll know for sure. If you want to see how the reticule moves in angular MOA's, set the ruler at 95 yards 17.5 inches. One inch will equal one angular MOA at that range. Note that with some scopes, one MOA's meant to be 1 inch at 100 yards; the original and standard for the shooting sports. On others, it's meant to be 1.0472 inch, or what an angular MOA is and has been the spec on some makes and models. Some makes of scopes are not real clear as to which standard they use. Measure what your scope does then you'll know. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Technical question for all of you who know what you are doing
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