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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need advice: drop at different elevations
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<blockquote data-quote="papa45" data-source="post: 386164" data-attributes="member: 3916"><p>Buffalobob,</p><p></p><p>I don't mean to argue with you, but I don't understand your answer. Presuming no change in temperature and muzzle velocity, trajectory is a bit flatter at higher elevations. A simple ballistics program I use says, going from 1000 ft to 6000 ft MSL, the POI changes about 5 inches at 600 yards, for a 180 gr, .30 cal bullet at 3000 fps MV. Am I missing something?</p><p></p><p>I've made myself crazy thinking about this for some of my own hunts. For most powders, colder temperature means lower velocity. As a practical matter, going from Texas to Wyoming (higher elevation, lower temperature) the two changes tend to cancel each other out and the net change becomes less significant. (Presuming no changes in barrel harmonics.)</p></blockquote><p></p>
[QUOTE="papa45, post: 386164, member: 3916"] Buffalobob, I don't mean to argue with you, but I don't understand your answer. Presuming no change in temperature and muzzle velocity, trajectory is a bit flatter at higher elevations. A simple ballistics program I use says, going from 1000 ft to 6000 ft MSL, the POI changes about 5 inches at 600 yards, for a 180 gr, .30 cal bullet at 3000 fps MV. Am I missing something? I've made myself crazy thinking about this for some of my own hunts. For most powders, colder temperature means lower velocity. As a practical matter, going from Texas to Wyoming (higher elevation, lower temperature) the two changes tend to cancel each other out and the net change becomes less significant. (Presuming no changes in barrel harmonics.) [/QUOTE]
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Need advice: drop at different elevations
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