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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Leupold Boone and Crockett Reticle
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<blockquote data-quote="sscoyote" data-source="post: 453383" data-attributes="member: 1133"><p>I think you're gonna have to buy the program sir. It's not just a matter of just looking it up on the internet. I have it also and love it. </p><p>Here's another option though--</p><p>Another way to do it is to adjust magnification (subtension) to true bullet drop by measuring and putting a mark on a 100 yd. target at each range that is close to each dot (i.e. if you're 18" low at 400 yds., that's 4.5 Shooter's MOA--now put a mark 4.5" below your aiming point at 100 yds. Now do the same for all ranges.) Now adjust the power of the scope up or down until the marks line up as close as possible with the stadia lines of the reticle, and mark that power. </p><p></p><p></p><p>This could actually be calculated long hand if someone wanted to and then matched up to a ballistics program by calculating the error at all stadia ranges (in MOA) and then calculating the avg. magnification change needed to bring them all into (close) alignment. This would be an advantage to understanding the math behind what's actually going on.</p><p></p><p>There are 2 mathematical concepts that are important for long-range shooting, IMO. The 1st is the inversely proportional relationship between reticle subtension vs. magnification--as magnification DECREASES reticle subtension INCREASES--which is actually what's going on here. </p><p></p><p>The second equation is the most basic form of the mil-ranging formula as it is the math that defines rangefinding and downrange zeroing with any reticle or turret value.</p></blockquote><p></p>
[QUOTE="sscoyote, post: 453383, member: 1133"] I think you're gonna have to buy the program sir. It's not just a matter of just looking it up on the internet. I have it also and love it. Here's another option though-- Another way to do it is to adjust magnification (subtension) to true bullet drop by measuring and putting a mark on a 100 yd. target at each range that is close to each dot (i.e. if you're 18" low at 400 yds., that's 4.5 Shooter's MOA--now put a mark 4.5" below your aiming point at 100 yds. Now do the same for all ranges.) Now adjust the power of the scope up or down until the marks line up as close as possible with the stadia lines of the reticle, and mark that power. This could actually be calculated long hand if someone wanted to and then matched up to a ballistics program by calculating the error at all stadia ranges (in MOA) and then calculating the avg. magnification change needed to bring them all into (close) alignment. This would be an advantage to understanding the math behind what's actually going on. There are 2 mathematical concepts that are important for long-range shooting, IMO. The 1st is the inversely proportional relationship between reticle subtension vs. magnification--as magnification DECREASES reticle subtension INCREASES--which is actually what's going on here. The second equation is the most basic form of the mil-ranging formula as it is the math that defines rangefinding and downrange zeroing with any reticle or turret value. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Leupold Boone and Crockett Reticle
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