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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
New scope has me confused
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<blockquote data-quote="Hugnot" data-source="post: 2292804" data-attributes="member: 115658"><p>This should help: provided aggravation is tolerated.</p><p></p><p>[ATTACH=full]299365[/ATTACH]</p><p></p><p>A mil dot scope if 1st FP or a 2nd FP set at a magnification to represent true mrad values can be used to estimate ranges if the size of an object is known. 18 inches is a common size object.</p><p></p><p>to estimate range or R = (target size in inches/36) * 1000 / mils = R</p><p></p><p>for example: an 18 inch diameter wheel of an abandoned farm vehicle spans the mid point dots having a 1 mil separation (the distance between dot centers), so</p><p>range = (18/36) * 1000 / 1 = 500 yards</p><p></p><p>a 16 inch distance between strands of a 3 wire barbed wire fence spans .8 mils (the distance between dot edges)</p><p>range = (16/36) *1000 /.8 = 555.55... or 556 yards</p><p></p><p>one dot exactly covers a 1 inch T post (one dot having a .2 mil span)</p><p>range = (1/36) * 1000/.2 = 138.888.. or 139 yards</p><p></p><p></p><p></p><p>Having a MOA scope with 1/4 MOA clicks entails some math, a nice little folding pocket calculator is a real big asset.</p><p></p><p>1 MOA at 100 yards = 1.047.... or 1.047 inches, 1 mrad at 100 = 3.6 inches</p><p>3.6 / 1.047 = 3.438 moa = 3.6 inches at 100</p><p></p><p>An ideal situation being shooting rock chucks at 500 yards with the 130 H ELDM bullet at 2980 fps.</p><p></p><p>The rock chuck is resting on top of a pile of half rotted boards next to an abandoned farm trailer having wheels 18 of diameter and these span the mil dots on your scope..</p><p>Range = range = (18/36) * 1000 / 1 = 500 yards</p><p></p><p>The range info sheet taped onto your rifle indicates a 6.6 MOA correction for a hit at 500, having a 200 yard zero. The click values on the scope are 1/4 MOA, 4 clicks per MOA, 6.6 * 4 = 26 clicks with 1 inch of daylight backline hold & vertical hold (head or tail end) up wind offset for wind velocity & direction.</p><p></p><p>should the MRAD reticle features be used to make the shot:</p><p></p><p>6.600 MOA up / 3.438 MOA per MRAD = 1.920 mrad up , go up 1 complete center to center interval & one center to dot edge interval with a little daylight.</p><p></p><p>I rather have a MRAD reticle matched with MRAD adjustments but you gotta use what you have.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2292804, member: 115658"] This should help: provided aggravation is tolerated. [ATTACH type="full" alt="Screenshot (233).png"]299365[/ATTACH] A mil dot scope if 1st FP or a 2nd FP set at a magnification to represent true mrad values can be used to estimate ranges if the size of an object is known. 18 inches is a common size object. to estimate range or R = (target size in inches/36) * 1000 / mils = R for example: an 18 inch diameter wheel of an abandoned farm vehicle spans the mid point dots having a 1 mil separation (the distance between dot centers), so range = (18/36) * 1000 / 1 = 500 yards a 16 inch distance between strands of a 3 wire barbed wire fence spans .8 mils (the distance between dot edges) range = (16/36) *1000 /.8 = 555.55... or 556 yards one dot exactly covers a 1 inch T post (one dot having a .2 mil span) range = (1/36) * 1000/.2 = 138.888.. or 139 yards Having a MOA scope with 1/4 MOA clicks entails some math, a nice little folding pocket calculator is a real big asset. 1 MOA at 100 yards = 1.047.... or 1.047 inches, 1 mrad at 100 = 3.6 inches 3.6 / 1.047 = 3.438 moa = 3.6 inches at 100 An ideal situation being shooting rock chucks at 500 yards with the 130 H ELDM bullet at 2980 fps. The rock chuck is resting on top of a pile of half rotted boards next to an abandoned farm trailer having wheels 18 of diameter and these span the mil dots on your scope.. Range = range = (18/36) * 1000 / 1 = 500 yards The range info sheet taped onto your rifle indicates a 6.6 MOA correction for a hit at 500, having a 200 yard zero. The click values on the scope are 1/4 MOA, 4 clicks per MOA, 6.6 * 4 = 26 clicks with 1 inch of daylight backline hold & vertical hold (head or tail end) up wind offset for wind velocity & direction. should the MRAD reticle features be used to make the shot: 6.600 MOA up / 3.438 MOA per MRAD = 1.920 mrad up , go up 1 complete center to center interval & one center to dot edge interval with a little daylight. I rather have a MRAD reticle matched with MRAD adjustments but you gotta use what you have. [/QUOTE]
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New scope has me confused
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