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Hunting
Long Range Hunting & Shooting
Elevation effects on bullet trajectory
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<blockquote data-quote="Mikecr" data-source="post: 2122769" data-attributes="member: 1521"><p>I don't know your bullet or velocity, but I can provide an example 'local BC' change for standard conditions at 3,200' -vs- 6,300'.</p><p>To begin, I'll guess a 28cal .700 G1BC under ICAO conditions (59degF, 29.92InHg station).</p><p></p><p>At standard conditions for 3,200' ASL, your local G1BC = .770.</p><p>Standard conditions here are 48degF, 26.62 InHg.</p><p></p><p>At standard conditions for 6,300' ASL, your local G1BC = .845.</p><p>Standard conditions here are 37degF, 23.71 InHg.</p><p></p><p>If your hunting conditions matched standard conditions for altitude, and your beginning BC matched my guess, you could simply adjust BC number.</p><p>To get it dead nuts would take local/up to the moment atmos measure and calcs.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2122769, member: 1521"] I don't know your bullet or velocity, but I can provide an example 'local BC' change for standard conditions at 3,200' -vs- 6,300'. To begin, I'll guess a 28cal .700 G1BC under ICAO conditions (59degF, 29.92InHg station). At standard conditions for 3,200' ASL, your local G1BC = .770. Standard conditions here are 48degF, 26.62 InHg. At standard conditions for 6,300' ASL, your local G1BC = .845. Standard conditions here are 37degF, 23.71 InHg. If your hunting conditions matched standard conditions for altitude, and your beginning BC matched my guess, you could simply adjust BC number. To get it dead nuts would take local/up to the moment atmos measure and calcs. [/QUOTE]
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