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Long Range Hunting & Shooting
Elevation effects on bullet trajectory
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<blockquote data-quote="Mikecr" data-source="post: 2133196" data-attributes="member: 1521"><p>A common issue with ballistic software, IMO, is actually a dismissal of Rh%.</p><p>For example, many do not adjust Mach# with Rh. This throws errors into their results, as the software looks up drag numbers per mach#.</p><p>This is often accompanied by 'it's not much'. </p><p>But it's really 'not much here' <u>and</u> 'not much there', adding, as they also dismiss it in their form factor calcs everywhere throughout the process.</p><p></p><p>We might observe humidity not mattering much, because humidity changes are typically less than temp and pressure, and it is a smaller affect to air density.</p><p>But here where I live(coastline), humidity is just always high. NEVER low summer or winter.</p><p>Where/when I hunt(mountains), it's always low, NEVER high.</p><p>I get to see it, my modified software fully accounts for it, and I need it to.</p><p></p><p>It's a smaller thing, similar to coriolis, spin drift, slope, level, resting firmness, mirage, etc. </p><p>But I think shooters who work to hit at distance with single cold bore shots, do not dismiss them, or their summation.</p><p>Temperature matters too. Powder merchandising does not get you out of barrel & bedding temps.</p><p>And pressure matters enough that you need to disregard every altitude shortcut and flat out measure & account for absolute pressure.</p><p>Each is easy to consider, so we can do so.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2133196, member: 1521"] A common issue with ballistic software, IMO, is actually a dismissal of Rh%. For example, many do not adjust Mach# with Rh. This throws errors into their results, as the software looks up drag numbers per mach#. This is often accompanied by 'it's not much'. But it's really 'not much here' [U]and[/U] 'not much there', adding, as they also dismiss it in their form factor calcs everywhere throughout the process. We might observe humidity not mattering much, because humidity changes are typically less than temp and pressure, and it is a smaller affect to air density. But here where I live(coastline), humidity is just always high. NEVER low summer or winter. Where/when I hunt(mountains), it's always low, NEVER high. I get to see it, my modified software fully accounts for it, and I need it to. It's a smaller thing, similar to coriolis, spin drift, slope, level, resting firmness, mirage, etc. But I think shooters who work to hit at distance with single cold bore shots, do not dismiss them, or their summation. Temperature matters too. Powder merchandising does not get you out of barrel & bedding temps. And pressure matters enough that you need to disregard every altitude shortcut and flat out measure & account for absolute pressure. Each is easy to consider, so we can do so. [/QUOTE]
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