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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Chamber pressure changes with altitude
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<blockquote data-quote="Michael Eichele" data-source="post: 1221176" data-attributes="member: 1007"><p>There is more to the answer than just yes or no.</p><p></p><p>Having a lot of air space in the case can affect your velocity as you go up in elevation or down in elevation (temperatures being the same).</p><p></p><p>This is one of the reasons I try to develop hunting loads with as full a case as possible. I live, develop loads and shoot near sea level most of the time whereas most of my hunting is at 5,500-8,500' and on occasions as high as 11,000'. I travel with a chronograph when I travel for hunting and always hit a rifle range to check zero and velocity. In every instance, having loads with poor load densities have always yielded higher velocities at higher elevations. Talking to the Huskemaw guys in Cody, they indicated they have experienced the same effect in the opposite direction in some loads since they develop at 5000+ feet and then travel to lower elevations near sea level, they're loosing velocity in some loads. I don't experience this with loads that have a high load density. Everybody is always worried about temperature sensitivity but often overlook elevation changes.</p><p></p><p>Something to think about.</p><p></p><p>Scientific proof? No. Pattern? He!! yes.</p><p></p><p>M</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 1221176, member: 1007"] There is more to the answer than just yes or no. Having a lot of air space in the case can affect your velocity as you go up in elevation or down in elevation (temperatures being the same). This is one of the reasons I try to develop hunting loads with as full a case as possible. I live, develop loads and shoot near sea level most of the time whereas most of my hunting is at 5,500-8,500' and on occasions as high as 11,000'. I travel with a chronograph when I travel for hunting and always hit a rifle range to check zero and velocity. In every instance, having loads with poor load densities have always yielded higher velocities at higher elevations. Talking to the Huskemaw guys in Cody, they indicated they have experienced the same effect in the opposite direction in some loads since they develop at 5000+ feet and then travel to lower elevations near sea level, they're loosing velocity in some loads. I don't experience this with loads that have a high load density. Everybody is always worried about temperature sensitivity but often overlook elevation changes. Something to think about. Scientific proof? No. Pattern? He!! yes. M [/QUOTE]
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Chamber pressure changes with altitude
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