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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Attention wildcat bullet shooters!
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<blockquote data-quote="Mikecr" data-source="post: 65264" data-attributes="member: 1521"><p>I don't know that all ballistic software utilizes a "corrected BC" in calculation of time of flight, etc.</p><p>I know some do.</p><p>I'm thinking many trust your BC input and calculate velocity ****** based on drag rather than a variable BC.</p><p>Your real BC(not published at ICAO or StdMetro) is effected by your mach number. And this has a marginally opposite relationship with air density to drag. For instance, a bullet with a .553BC, 3Kfps, ICAO, has a BC of .549 at 90deg. Notice BC dropped at higher temp. This is not "corrected" BC, but real -local BC. External ballistic programs would calculate from there, using this real BC in a number of ways(whatever method chosen).</p><p>An example can be seen using JBM's website calcs(like Drag/twist calc).</p><p>I don't know. Maybe I got it all screwy. It just seems weird to take a measured local BC to a different standard.</p><p>Maybe because I don't get alot of woodchucks at sea level and 59 degrees.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 65264, member: 1521"] I don't know that all ballistic software utilizes a "corrected BC" in calculation of time of flight, etc. I know some do. I'm thinking many trust your BC input and calculate velocity ****** based on drag rather than a variable BC. Your real BC(not published at ICAO or StdMetro) is effected by your mach number. And this has a marginally opposite relationship with air density to drag. For instance, a bullet with a .553BC, 3Kfps, ICAO, has a BC of .549 at 90deg. Notice BC dropped at higher temp. This is not "corrected" BC, but real -local BC. External ballistic programs would calculate from there, using this real BC in a number of ways(whatever method chosen). An example can be seen using JBM's website calcs(like Drag/twist calc). I don't know. Maybe I got it all screwy. It just seems weird to take a measured local BC to a different standard. Maybe because I don't get alot of woodchucks at sea level and 59 degrees. [/QUOTE]
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