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Rifles, Reloading, Optics, Equipment
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LabRadar question
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<blockquote data-quote="entoptics" data-source="post: 1642687" data-attributes="member: 104268"><p>I use <a href="http://www.jbmballistics.com/cgi-bin/jbmbcv-5.1.cgi" target="_blank">JBM ballistics</a>.</p><p></p><p>Rather than using the canned output for the various distances, I will open each individual tracking file in Excel, plot the data (distance vs velocity). If the data makes a nice linear trend, I'll pick a couple of points as far apart as possible in distance, and plug those into the calculator.</p><p></p><p>You can definitely use the calculated distance points from the LabRadar output, I just find more variability using that method. It helps to fire multiple shots and calculate the BC multiple times. This will give you an idea of how much variation the calculation brings into things.</p><p></p><p>Be sure to CAREFULLY record environmentals for each shot. I suggest using a real barometer/thermometer/hygrometer to measure pressure/temp/humidity. Getting it from something like a weather app, which may be fetching data from a weather station miles from your location, may not be accurate enough for good B.C. calculations. Relatively cheap weather station thermometers often have T and RH, and most modern smart phones have built in barometers, so you can get an app to give you the real station pressure right on your phone.</p></blockquote><p></p>
[QUOTE="entoptics, post: 1642687, member: 104268"] I use [URL='http://www.jbmballistics.com/cgi-bin/jbmbcv-5.1.cgi']JBM ballistics[/URL]. Rather than using the canned output for the various distances, I will open each individual tracking file in Excel, plot the data (distance vs velocity). If the data makes a nice linear trend, I'll pick a couple of points as far apart as possible in distance, and plug those into the calculator. You can definitely use the calculated distance points from the LabRadar output, I just find more variability using that method. It helps to fire multiple shots and calculate the BC multiple times. This will give you an idea of how much variation the calculation brings into things. Be sure to CAREFULLY record environmentals for each shot. I suggest using a real barometer/thermometer/hygrometer to measure pressure/temp/humidity. Getting it from something like a weather app, which may be fetching data from a weather station miles from your location, may not be accurate enough for good B.C. calculations. Relatively cheap weather station thermometers often have T and RH, and most modern smart phones have built in barometers, so you can get an app to give you the real station pressure right on your phone. [/QUOTE]
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