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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chamber pressure changes with altitude
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<blockquote data-quote="Pdvdh" data-source="post: 1294925" data-attributes="member: 4191"><p>Steve,</p><p>The change in pressure over 3,000' El is about 3psi.</p><p></p><p>The chamber pressure in the cartridge case is around 60,000psi. A 3psi increase or decrease to 60,000psi amounts to a 0.005% change in chamber pressure. Not discernable / measurable.</p><p></p><p>Not the source of sensed increase or decrease in chamber pressure. Or increased / decreased MV.</p><p></p><p>I don't think there is a science-based explanation for your observation. If there was, it would already be documented and published.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1294925, member: 4191"] Steve, The change in pressure over 3,000' El is about 3psi. The chamber pressure in the cartridge case is around 60,000psi. A 3psi increase or decrease to 60,000psi amounts to a 0.005% change in chamber pressure. Not discernable / measurable. Not the source of sensed increase or decrease in chamber pressure. Or increased / decreased MV. I don't think there is a science-based explanation for your observation. If there was, it would already be documented and published. [/QUOTE]
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Chamber pressure changes with altitude
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