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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: 341786" data-attributes="member: 5302"><p>Brian, your comments remind me of problems several people face. I've seen more than a few people with their 1000-yard zeros at the NRA range in Raton at 6600 feet elevation try to get on paper at Camp Perry's Viale range at 580 feet elevation in a 1000-yard match. Only to have their .308's putting bullets into the safety berm in front of the target. Helped a few get on target as I'd see the bullets kick up dirt in front of and below the target. </p><p></p><p>When a bunch of us were getting ready to shoot straight into a 25 - 30 mph headwind in a 600 yard match at Camp Pendleton, there was another interesting event. Several of the folks were commenting about that headwind changing the BC's of our bullets and they'd have to come up a few MOA to zero. A few disagreed with that premise. "Why else would the bullets strike lower?" was the comment often heard. These "believers" saw their first sighter go way high (2 or more MOA) after starting out with their sights set up that far above range zero, then were surprized to end up only 1/4th to 1/2 MOA higher than normal. Head and tail winds are often thought by shooters to cause large elevation changes to their sights for a given range.</p></blockquote><p></p>
[QUOTE="Bart B, post: 341786, member: 5302"] Brian, your comments remind me of problems several people face. I've seen more than a few people with their 1000-yard zeros at the NRA range in Raton at 6600 feet elevation try to get on paper at Camp Perry's Viale range at 580 feet elevation in a 1000-yard match. Only to have their .308's putting bullets into the safety berm in front of the target. Helped a few get on target as I'd see the bullets kick up dirt in front of and below the target. When a bunch of us were getting ready to shoot straight into a 25 - 30 mph headwind in a 600 yard match at Camp Pendleton, there was another interesting event. Several of the folks were commenting about that headwind changing the BC's of our bullets and they'd have to come up a few MOA to zero. A few disagreed with that premise. "Why else would the bullets strike lower?" was the comment often heard. These "believers" saw their first sighter go way high (2 or more MOA) after starting out with their sights set up that far above range zero, then were surprized to end up only 1/4th to 1/2 MOA higher than normal. Head and tail winds are often thought by shooters to cause large elevation changes to their sights for a given range. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Altitude vs. Barometric pressure
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