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Long Range Hunting & Shooting
Trueing muzzle velocity vs BC
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<blockquote data-quote="Pdvdh" data-source="post: 2588440" data-attributes="member: 4191"><p>I also calculate the bullet's BC value from my barrel, using velocity decay over the first 100yds of bullet flight. LabRadar provides the velocity decay data. That calculated BC value is very close to true value over the first 100yds of bullet flight, as it's based on the average bullet velocity decay from multiple bullets fired during load development and future shooting events. If I fire 8, 10, or 12 bullets on one outing, I review the quality and consistency of the LabRadar data for each bullet fired. The velocity loss from 0-20yds, 20-40yds, 40-60yds, 60-80yds, and 80-100yds for each bullet fired is compared for consistency. Good quality data will show very similar velocity loss per 20yd increments of bullet flight. Then I'll average the recorded velocity loss for that group of bullets. Use that data to calculate my BC value based on my station conditions </p><p></p><p>After these steps, I find the tweaking of the bullet BC input value from my calculated value, necessary to produce correct long range bullet drop predictions from ColdBore 1.0, are relatively minor.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 2588440, member: 4191"] I also calculate the bullet's BC value from my barrel, using velocity decay over the first 100yds of bullet flight. LabRadar provides the velocity decay data. That calculated BC value is very close to true value over the first 100yds of bullet flight, as it's based on the average bullet velocity decay from multiple bullets fired during load development and future shooting events. If I fire 8, 10, or 12 bullets on one outing, I review the quality and consistency of the LabRadar data for each bullet fired. The velocity loss from 0-20yds, 20-40yds, 40-60yds, 60-80yds, and 80-100yds for each bullet fired is compared for consistency. Good quality data will show very similar velocity loss per 20yd increments of bullet flight. Then I'll average the recorded velocity loss for that group of bullets. Use that data to calculate my BC value based on my station conditions After these steps, I find the tweaking of the bullet BC input value from my calculated value, necessary to produce correct long range bullet drop predictions from ColdBore 1.0, are relatively minor. [/QUOTE]
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Trueing muzzle velocity vs BC
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