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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chamber pressure changes with altitude
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<blockquote data-quote="BallisticsGuy" data-source="post: 1221339" data-attributes="member: 96226"><p>Controlling atmospheric pressure isn't necessary really. It only has to be known to quantify MV and pressure departures from known sea level data. What I'll end up doing is going to my normal range which is usually around 29.3inHg, do a run of tests on cases with roughly 25, 50 and 90 grains capacity (so roughly .223, .308 and belted magnum) then run up to a little spot I know at around 9k and then circle back down the hill to another spot at 6k and the last at 3k. With MV's, 100m zero shift data and pressure data we'll get enough data points that we should be able to determine what's happening or at least form a hypothesis that can be further tested against.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 1221339, member: 96226"] Controlling atmospheric pressure isn't necessary really. It only has to be known to quantify MV and pressure departures from known sea level data. What I'll end up doing is going to my normal range which is usually around 29.3inHg, do a run of tests on cases with roughly 25, 50 and 90 grains capacity (so roughly .223, .308 and belted magnum) then run up to a little spot I know at around 9k and then circle back down the hill to another spot at 6k and the last at 3k. With MV's, 100m zero shift data and pressure data we'll get enough data points that we should be able to determine what's happening or at least form a hypothesis that can be further tested against. [/QUOTE]
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Chamber pressure changes with altitude
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