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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
260 ackley calculation help needed
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<blockquote data-quote="codyadams" data-source="post: 1157182" data-attributes="member: 87243"><p>Are you using the correct barometric pressure when you calculate ballistics? This can make a big difference. With my .308, I have chronoed many times at 2675 fps. If I put in a pressure of 30 (about what my kestrel corrected to sea level, or about what pressure at sea level would be) I have to raise my velocity to around 3000 in my app for it to be correct with my actual ballistics at an ACTUAL pressure of 23 (@7600 ft elevation at time of test) so use a kestrel or look at your absolute pressure at your elevation. I don't trust the 'average pressure at your elevation' setting that some have, because it's just that, an average, not an exact.</p></blockquote><p></p>
[QUOTE="codyadams, post: 1157182, member: 87243"] Are you using the correct barometric pressure when you calculate ballistics? This can make a big difference. With my .308, I have chronoed many times at 2675 fps. If I put in a pressure of 30 (about what my kestrel corrected to sea level, or about what pressure at sea level would be) I have to raise my velocity to around 3000 in my app for it to be correct with my actual ballistics at an ACTUAL pressure of 23 (@7600 ft elevation at time of test) so use a kestrel or look at your absolute pressure at your elevation. I don't trust the 'average pressure at your elevation' setting that some have, because it's just that, an average, not an exact. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
260 ackley calculation help needed
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