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Do Bullets Go To Sleep?
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<blockquote data-quote="Michael Courtney" data-source="post: 889744" data-attributes="member: 28191"><p>Our experimental work has shown that bullets can often exhibit as much as 10-15% shot to shot variations in BC. Both our work and Bryan Litz work has shown that hollow point match bullets tend to be some of the worst offenders when it comes to shot to shot BC variations. We choose a plastic-tipped bullet to study yaw dependent drag variations because this bullet has about the smallest shot to shot drag variations that we have seen. There are a number of articles around that discuss meplat pointing and trimming as an approach to reduce shot to shot variations in BC. See:</p><p></p><p><a href="http://www.appliedballisticsllc.com/index_files/Lapua_Scenar.pdf" target="_blank">http://www.appliedballisticsllc.com/index_files/Lapua_Scenar.pdf</a></p><p></p><p><a href="http://www.appliedballisticsllc.com/index_files/7mmNumberOne.pdf" target="_blank">http://www.appliedballisticsllc.com/index_files/7mmNumberOne.pdf</a></p><p></p><p><a href="http://bulletin.accurateshooter.com/tag/bullet-pointing/" target="_blank">Bullet Pointing « Daily Bulletin</a></p><p></p><p>It is simple enough to run numbers for your own favorite bullets and ranges at JBM to see how much a +5% and a -5% BC variations will effect your trajectory at the relevant ranges.</p><p></p><p></p><p></p><p>This would only make sense if you had the whole Cd vs. V curve for a given bullet from a given rifle. Rifle to rifle variations introduce bigger uncertainties than the errors introduced by a given BC drag model, especially now that we have the G7 drag model. Measuring a G7 BC with a specific rifle and attending to reductions in BC variations with the pointing or trimming techniques (or using a plastic tipped bullet) will do much more for long range accuracy and predictability than measuring the whole Cd vs. V curve.</p></blockquote><p></p>
[QUOTE="Michael Courtney, post: 889744, member: 28191"] Our experimental work has shown that bullets can often exhibit as much as 10-15% shot to shot variations in BC. Both our work and Bryan Litz work has shown that hollow point match bullets tend to be some of the worst offenders when it comes to shot to shot BC variations. We choose a plastic-tipped bullet to study yaw dependent drag variations because this bullet has about the smallest shot to shot drag variations that we have seen. There are a number of articles around that discuss meplat pointing and trimming as an approach to reduce shot to shot variations in BC. See: [url]http://www.appliedballisticsllc.com/index_files/Lapua_Scenar.pdf[/url] [url]http://www.appliedballisticsllc.com/index_files/7mmNumberOne.pdf[/url] [url=http://bulletin.accurateshooter.com/tag/bullet-pointing/]Bullet Pointing « Daily Bulletin[/url] It is simple enough to run numbers for your own favorite bullets and ranges at JBM to see how much a +5% and a -5% BC variations will effect your trajectory at the relevant ranges. This would only make sense if you had the whole Cd vs. V curve for a given bullet from a given rifle. Rifle to rifle variations introduce bigger uncertainties than the errors introduced by a given BC drag model, especially now that we have the G7 drag model. Measuring a G7 BC with a specific rifle and attending to reductions in BC variations with the pointing or trimming techniques (or using a plastic tipped bullet) will do much more for long range accuracy and predictability than measuring the whole Cd vs. V curve. [/QUOTE]
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