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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chamber pressure changes with altitude
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<blockquote data-quote="RockyMtnMT" data-source="post: 1294806" data-attributes="member: 7999"><p>We have not noticed changes in velocity at different altitude. Have suspected it, so have not checked it. We have noticed that loads developed at our altitude of 3000' for top end performance will over pressure at 800' elevation. My conclusion to this is the increase in atmospheric pressure at lower elevation adds to the pressure of the load causing the over pressure. This would indicate a load developed at low elevation would have less pressure at higher elevation. Now in my simple mind pressure is an indication of vel. More pressure = more vel. This would have the opposite effect of the original post. Right? When this over pressure happened to us we fixed it by reducing the load 2 or 3g. I don't remember exactly. And I do not remember if the vel wound up being lower or not. Brian may have that data. For our situation we simply do not work up top loads that will be used at lower elevation anymore.</p><p></p><p>I am not even sure if this is relative to this conversation or not. </p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1294806, member: 7999"] We have not noticed changes in velocity at different altitude. Have suspected it, so have not checked it. We have noticed that loads developed at our altitude of 3000' for top end performance will over pressure at 800' elevation. My conclusion to this is the increase in atmospheric pressure at lower elevation adds to the pressure of the load causing the over pressure. This would indicate a load developed at low elevation would have less pressure at higher elevation. Now in my simple mind pressure is an indication of vel. More pressure = more vel. This would have the opposite effect of the original post. Right? When this over pressure happened to us we fixed it by reducing the load 2 or 3g. I don't remember exactly. And I do not remember if the vel wound up being lower or not. Brian may have that data. For our situation we simply do not work up top loads that will be used at lower elevation anymore. I am not even sure if this is relative to this conversation or not. Steve [/QUOTE]
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Chamber pressure changes with altitude
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