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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
calculating bc
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<blockquote data-quote="groper" data-source="post: 454044" data-attributes="member: 12550"><p>Well i did something interesting today... i took a laptop and a microphone into the trench below the target whilst my friend shot from 1000yds away... </p><p></p><p>I recorded the soundtrack using "audacity" and then once id collected the data, i used the spectogram waveform to isolate the time difference of the sonic crack of the bullet flying overhead from the muzzle report a short time later.</p><p></p><p>Using the Time of Flight in the ballisitcs calculator, and the time it takes sound to travel 1000yds @ 26deg C, i could accurately predict his muzzle velocities to less than 1% error assuming we had an accurate BC. I recorded a string of 5 shots and even gave him the extreme spread for his load! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>So, Using similar ideology in conjunction with an accurate chrony at the muzzle, we could reverse calculate a G7 BC in the same way. Beleive it or not, it is surprisingly accurate and you can clearly record time differences of .0005 seconds resolution.</p><p></p><p>Heres an article that explains the idea... - <a href="http://arxiv.org/ftp/physics/papers/0601/0601102.pdf" target="_blank">http://arxiv.org/ftp/physics/papers/0601/0601102.pdf</a></p></blockquote><p></p>
[QUOTE="groper, post: 454044, member: 12550"] Well i did something interesting today... i took a laptop and a microphone into the trench below the target whilst my friend shot from 1000yds away... I recorded the soundtrack using "audacity" and then once id collected the data, i used the spectogram waveform to isolate the time difference of the sonic crack of the bullet flying overhead from the muzzle report a short time later. Using the Time of Flight in the ballisitcs calculator, and the time it takes sound to travel 1000yds @ 26deg C, i could accurately predict his muzzle velocities to less than 1% error assuming we had an accurate BC. I recorded a string of 5 shots and even gave him the extreme spread for his load! :) So, Using similar ideology in conjunction with an accurate chrony at the muzzle, we could reverse calculate a G7 BC in the same way. Beleive it or not, it is surprisingly accurate and you can clearly record time differences of .0005 seconds resolution. Heres an article that explains the idea... - [URL]http://arxiv.org/ftp/physics/papers/0601/0601102.pdf[/URL] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
calculating bc
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