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Hunting
The Basics, Starting Out
Bullet drop compensation dials (BDC dials)
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<blockquote data-quote="jwp475" data-source="post: 108859" data-attributes="member: 3776"><p>My ballistics program ( which is the ExBall Nightforce version) will give give drop tables any way that you want them MOA,inches, metric,etc.Acctualy one moa at 100 yards is 1.047 inches most just round of to 1 inch for purposes of conversation.The difference does add up as the range gets longer, 5 to6 hundred yards only amount to a little over 1/4" at 600. but 1000 and beyound the difference of .047 inch begins to show, if one is after precision.</p><p> If you live at say sea level and your bdc is calculated for this alltitude and you book a Deer hunt in another state and the elevation of your hunt is 7500 feet,the difference in correction will be considerable.Let's say that you are shooting a 308 175 grain SMK with a 100 yard sight in, your correction (at 600 yards at sea level and 59 degrees with 78% humidity)is 15 moa or 94 inches the same conditions at 7500 feet elevation is 13.5 moa or 84.7 inces. How do you account for this difference with a bdc? The difference is quite easy to allow for with target knobs, as well as correction for windage. The bdc's are for people that do not totaly understand long range shooting.I started as one of those that did not understand as I had bdc's,but the more you learn the more you will see the weaknesses of the bdc's</p></blockquote><p></p>
[QUOTE="jwp475, post: 108859, member: 3776"] My ballistics program ( which is the ExBall Nightforce version) will give give drop tables any way that you want them MOA,inches, metric,etc.Acctualy one moa at 100 yards is 1.047 inches most just round of to 1 inch for purposes of conversation.The difference does add up as the range gets longer, 5 to6 hundred yards only amount to a little over 1/4" at 600. but 1000 and beyound the difference of .047 inch begins to show, if one is after precision. If you live at say sea level and your bdc is calculated for this alltitude and you book a Deer hunt in another state and the elevation of your hunt is 7500 feet,the difference in correction will be considerable.Let's say that you are shooting a 308 175 grain SMK with a 100 yard sight in, your correction (at 600 yards at sea level and 59 degrees with 78% humidity)is 15 moa or 94 inches the same conditions at 7500 feet elevation is 13.5 moa or 84.7 inces. How do you account for this difference with a bdc? The difference is quite easy to allow for with target knobs, as well as correction for windage. The bdc's are for people that do not totaly understand long range shooting.I started as one of those that did not understand as I had bdc's,but the more you learn the more you will see the weaknesses of the bdc's [/QUOTE]
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The Basics, Starting Out
Bullet drop compensation dials (BDC dials)
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