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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
G7 > G1 ; resistance to BC change
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<blockquote data-quote="LouBoyd" data-source="post: 505905" data-attributes="member: 9253"><p>Yes to using sofware which handles muliple velocity segments. The one I use is the companion program to Quickload called Quicktarget. Whether that method is statisfactory depends on what you're trying to achieve. Sierra does provide multiple G1 BCs for many of their bullets. The results are ok except at transonic velocities. </p><p></p><p>If your ballistic program has external files for the G models or if you have source code and can re-comple the program with your own custom bullet models instead of using the standard G1-G7 models. One could working up thier own "G" function using shooting tests just as were done to generate the original G functions. Then that model would give the bullet used a BC of 1.0 at all velocities. </p><p></p><p>Gathering the data on the bullet is the difficult part. Multiple chronograh screens are the most direct method but they're unwiedy to set up and maintain. . A millimeter wave radar is the best but expensive. Here's an article showing what it can do and how to use it. </p><p></p><p> <a href="http://www.exteriorballistics.com/ebexplained/5th/25.cfm" target="_blank">exterior ballistics</a></p><p></p><p>It also shows how Sierra determines the multiple G1 BCs they publish, it's limitations, and why it's better than a single value BC.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 505905, member: 9253"] Yes to using sofware which handles muliple velocity segments. The one I use is the companion program to Quickload called Quicktarget. Whether that method is statisfactory depends on what you're trying to achieve. Sierra does provide multiple G1 BCs for many of their bullets. The results are ok except at transonic velocities. If your ballistic program has external files for the G models or if you have source code and can re-comple the program with your own custom bullet models instead of using the standard G1-G7 models. One could working up thier own "G" function using shooting tests just as were done to generate the original G functions. Then that model would give the bullet used a BC of 1.0 at all velocities. Gathering the data on the bullet is the difficult part. Multiple chronograh screens are the most direct method but they're unwiedy to set up and maintain. . A millimeter wave radar is the best but expensive. Here's an article showing what it can do and how to use it. [url=http://www.exteriorballistics.com/ebexplained/5th/25.cfm]exterior ballistics[/url] It also shows how Sierra determines the multiple G1 BCs they publish, it's limitations, and why it's better than a single value BC. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
G7 > G1 ; resistance to BC change
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