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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Calculating B.C. with LabRadar. Tutorial on my method.
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<blockquote data-quote="Pdvdh" data-source="post: 2618347" data-attributes="member: 4191"><p>That's a bunch of information to digest. I've been calculating bullet BC values using my LabRadar for ~5 years.</p><p></p><p>I read your post, but I didn't open your attached document and analyze your excel program, macros, spreadsheet.</p><p></p><p>Interesting that you reliably record .308 bullet velocity out to 180yds. I normally lose data quality at 100-125 yds for 30 cal diameter bullets. So the past 3-4 years, I set my LabRadar to collect velocity out to 100yds. I record velocity data virtually every time I shoot. And then revisit my BC values again. Even with my 100yd data limit, I find very consistent BC values over time. Which bolsters my confidence that 100yd velocity tracking is sufficient to calculate solid G7 BC values. And that the LabRadar is reliably recording data, consistently over time.</p><p></p><p>How different would your calculated BC values be if you used velocity decay data over 100yds bullet flight versus 180 yards? Significant differences? The differences I see between 80yd and 100yd downrange velocity data has been minimal. 80yds of data would yield the same G7 BC value as 100yds of bullet velocity. Over time, I'll see variances of approximately +/- 0.003. Which I consider excellent...</p><p></p><p>Multiple reasons I continue to record LabRadar velocities and calculate my own BC values. The biggest being, I've learned I start with a truer G7 BC, when calculating one from bullets fired from my barrels. Compared to the manufacturer's value.</p><p></p><p>I do expect the tech level of your thread, and the described process, is going to exceed the interest level of most. For one reason or another. But I applaud <img class="smilie smilie--emoji" loading="lazy" alt="👏" title="Clapping hands :clap:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44f.png" data-shortname=":clap:" /> your efforts.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 2618347, member: 4191"] That's a bunch of information to digest. I've been calculating bullet BC values using my LabRadar for ~5 years. I read your post, but I didn't open your attached document and analyze your excel program, macros, spreadsheet. Interesting that you reliably record .308 bullet velocity out to 180yds. I normally lose data quality at 100-125 yds for 30 cal diameter bullets. So the past 3-4 years, I set my LabRadar to collect velocity out to 100yds. I record velocity data virtually every time I shoot. And then revisit my BC values again. Even with my 100yd data limit, I find very consistent BC values over time. Which bolsters my confidence that 100yd velocity tracking is sufficient to calculate solid G7 BC values. And that the LabRadar is reliably recording data, consistently over time. How different would your calculated BC values be if you used velocity decay data over 100yds bullet flight versus 180 yards? Significant differences? The differences I see between 80yd and 100yd downrange velocity data has been minimal. 80yds of data would yield the same G7 BC value as 100yds of bullet velocity. Over time, I'll see variances of approximately +/- 0.003. Which I consider excellent... Multiple reasons I continue to record LabRadar velocities and calculate my own BC values. The biggest being, I've learned I start with a truer G7 BC, when calculating one from bullets fired from my barrels. Compared to the manufacturer's value. I do expect the tech level of your thread, and the described process, is going to exceed the interest level of most. For one reason or another. But I applaud 👏 your efforts. [/QUOTE]
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Calculating B.C. with LabRadar. Tutorial on my method.
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