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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Altitude vs. Barometric pressure
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<blockquote data-quote="Bart B" data-source="post: 1195019" data-attributes="member: 5302"><p>This is the first time I've heard of any gravity issue. </p><p></p><p>Never in my thousands of talks with long range rifle shooters at matches and social events with many of them has this issue came up regarding altitudes of 100 to 6,600 feet above sea level shooting 1000 yard matches. Nor has that of coriolis and spin drift. But such things appear on web sites very often and claimed to be very important.</p><p></p><p>Exactly how much difference in bullet drop at 1000 is there for a 30 caliber 200 grain bullet with a BC of .560 leaving at 3000 fps at 200 feet and 6600 feet elevation in standard atmospheric conditdions?</p><p></p><p>Is it greater than a 1% spread in that bullet's BC would cause?</p></blockquote><p></p>
[QUOTE="Bart B, post: 1195019, member: 5302"] This is the first time I've heard of any gravity issue. Never in my thousands of talks with long range rifle shooters at matches and social events with many of them has this issue came up regarding altitudes of 100 to 6,600 feet above sea level shooting 1000 yard matches. Nor has that of coriolis and spin drift. But such things appear on web sites very often and claimed to be very important. Exactly how much difference in bullet drop at 1000 is there for a 30 caliber 200 grain bullet with a BC of .560 leaving at 3000 fps at 200 feet and 6600 feet elevation in standard atmospheric conditdions? Is it greater than a 1% spread in that bullet's BC would cause? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Altitude vs. Barometric pressure
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