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The Basics, Starting Out
Drag functions and drop charts
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<blockquote data-quote="Mysticplayer" data-source="post: 113493" data-attributes="member: 8947"><p>JBM, thanks for the info. Been using your software for the last few years and am very happy with the results. Nice to see all the changes on your site. Now I can't find anything /ubbthreads/images/graemlins/grin.gif</p><p></p><p>I think you hit the nail on the head. BC has become the holy grail that is used/misused to sell product. It really is a meaningless number unless you take into account the assumptions that are made.</p><p></p><p>Precious few shooters actually know what the BC means in real terms.</p><p></p><p>I think that many bullet manf are understating their BC so that consumers will not go BS and slag the company.</p><p></p><p>What would happen if someone said BC 0.625 BUT a G7 curve? Run that through a G1 comparison as on your software and HOLY S...can't be true.</p><p></p><p>Conversely, there are some who use an 'elevated' BC number by using a more favorable drag curve function in their calculations.</p><p></p><p>No standards and too much smoke/mirrors.</p><p></p><p>Only way to know for sure is to launch them in your rifle, your scope and rangefinder. Then you create data that is precisely incorrect except for this one set of circumstances.</p><p></p><p>Ultimately, if it is reliable and repeatable, that is what matters to LR shooters/hunters. The actual numbers don't really matter.</p><p></p><p>But it makes for great conversations...</p><p></p><p>Jerry</p><p></p><p>PS the drop table I created for that 162gr Amax shooting 7RM agreed with my real world drops out to 940yds to the click. One BC number can work IF the drag curve/scope/rangefinder/shooter/etc. fit. Unfortunately, that is very rare.</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 113493, member: 8947"] JBM, thanks for the info. Been using your software for the last few years and am very happy with the results. Nice to see all the changes on your site. Now I can't find anything [img]/ubbthreads/images/graemlins/grin.gif[/img] I think you hit the nail on the head. BC has become the holy grail that is used/misused to sell product. It really is a meaningless number unless you take into account the assumptions that are made. Precious few shooters actually know what the BC means in real terms. I think that many bullet manf are understating their BC so that consumers will not go BS and slag the company. What would happen if someone said BC 0.625 BUT a G7 curve? Run that through a G1 comparison as on your software and HOLY S...can't be true. Conversely, there are some who use an 'elevated' BC number by using a more favorable drag curve function in their calculations. No standards and too much smoke/mirrors. Only way to know for sure is to launch them in your rifle, your scope and rangefinder. Then you create data that is precisely incorrect except for this one set of circumstances. Ultimately, if it is reliable and repeatable, that is what matters to LR shooters/hunters. The actual numbers don't really matter. But it makes for great conversations... Jerry PS the drop table I created for that 162gr Amax shooting 7RM agreed with my real world drops out to 940yds to the click. One BC number can work IF the drag curve/scope/rangefinder/shooter/etc. fit. Unfortunately, that is very rare. [/QUOTE]
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Drag functions and drop charts
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