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The Basics, Starting Out
Math for dummies/noobies
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<blockquote data-quote="britz" data-source="post: 273304" data-attributes="member: 7865"><p>BB is right. There is no accurate "rule of thumb" because LRshooting is all about accuracy. wind drift has to do with arrow dynamics and velocity. Ballistic Coefficient will determine how fast the bullet will slow down and every different bullet has a different BC. look at a 22-250 40grain pushing 3900 fps that will have minimal wind deflection at 200 yards but a whole heck of a lot at 700. Now compare to a 300 win mag pushing a higher BC bullet at around 3000fps that will have slightly more at 200 but way way less at 700. </p><p></p><p>Long story short, there is no simple way to be right on. Just make a drop chart and a wind chart and go from there. One general rule of thumb is that if you have a chart set up for 10 mph winds and you are experiencing 5 mph, you cut your numbers in half. If you are experiencing 15 mph winds, you multiply your drift by 1.5. 20mph... x2 and so on.</p><p></p><p>hope this helps, Mark.</p></blockquote><p></p>
[QUOTE="britz, post: 273304, member: 7865"] BB is right. There is no accurate "rule of thumb" because LRshooting is all about accuracy. wind drift has to do with arrow dynamics and velocity. Ballistic Coefficient will determine how fast the bullet will slow down and every different bullet has a different BC. look at a 22-250 40grain pushing 3900 fps that will have minimal wind deflection at 200 yards but a whole heck of a lot at 700. Now compare to a 300 win mag pushing a higher BC bullet at around 3000fps that will have slightly more at 200 but way way less at 700. Long story short, there is no simple way to be right on. Just make a drop chart and a wind chart and go from there. One general rule of thumb is that if you have a chart set up for 10 mph winds and you are experiencing 5 mph, you cut your numbers in half. If you are experiencing 15 mph winds, you multiply your drift by 1.5. 20mph... x2 and so on. hope this helps, Mark. [/QUOTE]
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