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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
dialing in long range game
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<blockquote data-quote="Brent" data-source="post: 28569" data-attributes="member: 99"><p>The one thing I would add to Dave's most excellent advice, is that after you measure the actual drop in inches and adjust for the new range, verify it with another group to see if the setting you figured actually brings the group up to the center of the bull. There is a chance you could be high or low a few inches if your scope isn't calibrated correctly and it must be verified.</p><p></p><p>You should be able to match your fired drops up to a ballistic program at each interval they were shot at if you know your average MV, and by adjusting the BC of the bullet until the drops on the program match your fired drops. If you don't have a perfect 100yd zero, the program will likely be quite a bit off at distance, as it assumes you are not .25 or even .5 MOA or more off to begin with, so dial it in well at 100yds. </p><p></p><p>Once you get the actual drops matched up with the program at say, 100 yards increment, the program will be able to predict the drop for ranges in between them pretty accurately, BUT this is no guarantee it will predict farther distances accurately, and it probably WON'T either. The BC drag curve and other things will affect its modeling ability so it needs to be verified well.</p><p></p><p>This will also give you more confidence in your load and shooting technique, and also your real world grouping ability at the various ranges which will help you determine how far you might be able to shoot in the same conditions etc.</p><p></p><p>Good luck, knock one dead! <img src="http://images/icons/smile.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Brent, post: 28569, member: 99"] The one thing I would add to Dave's most excellent advice, is that after you measure the actual drop in inches and adjust for the new range, verify it with another group to see if the setting you figured actually brings the group up to the center of the bull. There is a chance you could be high or low a few inches if your scope isn't calibrated correctly and it must be verified. You should be able to match your fired drops up to a ballistic program at each interval they were shot at if you know your average MV, and by adjusting the BC of the bullet until the drops on the program match your fired drops. If you don't have a perfect 100yd zero, the program will likely be quite a bit off at distance, as it assumes you are not .25 or even .5 MOA or more off to begin with, so dial it in well at 100yds. Once you get the actual drops matched up with the program at say, 100 yards increment, the program will be able to predict the drop for ranges in between them pretty accurately, BUT this is no guarantee it will predict farther distances accurately, and it probably WON'T either. The BC drag curve and other things will affect its modeling ability so it needs to be verified well. This will also give you more confidence in your load and shooting technique, and also your real world grouping ability at the various ranges which will help you determine how far you might be able to shoot in the same conditions etc. Good luck, knock one dead! [img]images/icons/smile.gif[/img] [/QUOTE]
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dialing in long range game
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