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Long Range Hunting & Shooting
Trueing muzzle velocity vs BC
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<blockquote data-quote="codyadams" data-source="post: 2521579" data-attributes="member: 87243"><p>I measure velocity with a ladradar while validating drops, compare my impacts to my velocity, and true bullet bc. Yes, lots ot effort has gone into figuring out what the bc of that bullet is. Then when it goes through your barrel the bearing surface contour is changed. 3 groove, 4 groove, 5 groove, 6 groove, how deep your rifling is, all this can change what the bc of the bullet is as it flies through the air.</p><p></p><p>Also, if your dialing and want to be 100% accurate, it could help to figure out variances in your scope tracking. Even some Alpha level glass has shown that tracking, while repeatable, can still be less than 100% accurate, and all scopes can fail. Though, most of the time the variances are not enough to show up. Most rifles/shooters/loads aren't accurate enough to account for all this anyway. If you have a solid device to check tracking of a scope prior to doing your trajectory validation, you can account for any imperfections in tracking, as long as repeatable, prior to actually shooting for drops.</p><p></p><p>Bottom line for me, I am tracking my velocity for every shot when confirming trajectory. Bullet bc can, and will change from barrel to barrel, this has been proven. So that is the number that I tweak to fit my drops. If variations from a well known listed bc is significant, I do a tall target test at 100 yards to the distance I had significant variation, and to my max adjustment available in my optic to see if my scope tracking could be the culprit. I know shooting a tall target test is not 100% reliable or accurate, but it is close enough to show if there are significant errors in tracking. If my scope tracking is not true, as long as it is repeatable, I can account for it in my applied ballistics app.</p></blockquote><p></p>
[QUOTE="codyadams, post: 2521579, member: 87243"] I measure velocity with a ladradar while validating drops, compare my impacts to my velocity, and true bullet bc. Yes, lots ot effort has gone into figuring out what the bc of that bullet is. Then when it goes through your barrel the bearing surface contour is changed. 3 groove, 4 groove, 5 groove, 6 groove, how deep your rifling is, all this can change what the bc of the bullet is as it flies through the air. Also, if your dialing and want to be 100% accurate, it could help to figure out variances in your scope tracking. Even some Alpha level glass has shown that tracking, while repeatable, can still be less than 100% accurate, and all scopes can fail. Though, most of the time the variances are not enough to show up. Most rifles/shooters/loads aren't accurate enough to account for all this anyway. If you have a solid device to check tracking of a scope prior to doing your trajectory validation, you can account for any imperfections in tracking, as long as repeatable, prior to actually shooting for drops. Bottom line for me, I am tracking my velocity for every shot when confirming trajectory. Bullet bc can, and will change from barrel to barrel, this has been proven. So that is the number that I tweak to fit my drops. If variations from a well known listed bc is significant, I do a tall target test at 100 yards to the distance I had significant variation, and to my max adjustment available in my optic to see if my scope tracking could be the culprit. I know shooting a tall target test is not 100% reliable or accurate, but it is close enough to show if there are significant errors in tracking. If my scope tracking is not true, as long as it is repeatable, I can account for it in my applied ballistics app. [/QUOTE]
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Trueing muzzle velocity vs BC
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