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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
HELP Ballistics program wrong
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<blockquote data-quote="adam" data-source="post: 440679" data-attributes="member: 9382"><p>I am not intimately familiar with the .204 and its bullets, however in general such a light bullet will likely be losing velocity very quickly at those ranges,which means that any inaccuracy in the data input can cause a very large difference between actual impact and predicted. You are likely at the extreme edge past 500 or so. Not that you cant do it, its just going to require excellent preparation.</p><p></p><p>Different software can be more or less accurate, but I am going to guess that the compounding errors in data are the problem and not the software. For giggles enter some values around the values you entered. I suspect you will find that a small atmosphere difference can account for your error way out there.</p><p></p><p>Listed in a very lose order of importance are factors you should consider, assuming that you have verified the click values of the scope and mechanicals of the gun.</p><p></p><p>Atmospheric pressure and temperature</p><p></p><p>Angle of sight for the shot,</p><p></p><p>actual BC of the bullet at different speeds</p><p></p><p>accurate range estimation... GPS may not be good enough for your combo. Plus or minus 10 yds on each data point could do it.</p><p></p><p>at that range, the error in the chronograph speed could also account for the error you report.</p><p></p><p>Many other small factors i have likely forgotten to list.</p></blockquote><p></p>
[QUOTE="adam, post: 440679, member: 9382"] I am not intimately familiar with the .204 and its bullets, however in general such a light bullet will likely be losing velocity very quickly at those ranges,which means that any inaccuracy in the data input can cause a very large difference between actual impact and predicted. You are likely at the extreme edge past 500 or so. Not that you cant do it, its just going to require excellent preparation. Different software can be more or less accurate, but I am going to guess that the compounding errors in data are the problem and not the software. For giggles enter some values around the values you entered. I suspect you will find that a small atmosphere difference can account for your error way out there. Listed in a very lose order of importance are factors you should consider, assuming that you have verified the click values of the scope and mechanicals of the gun. Atmospheric pressure and temperature Angle of sight for the shot, actual BC of the bullet at different speeds accurate range estimation... GPS may not be good enough for your combo. Plus or minus 10 yds on each data point could do it. at that range, the error in the chronograph speed could also account for the error you report. Many other small factors i have likely forgotten to list. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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HELP Ballistics program wrong
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