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Long Range Tricks And Toys By Ian McMurchy
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<blockquote data-quote="landcbeitner" data-source="post: 186830" data-attributes="member: 10214"><p>My grandfather and father taught me from an early age that gravity pulls straight down toward the center of the earth, if I shoot straight up the bullet will not have any drop. gravity can only pull the bullet straight down so if you shoot steep up or down the gravity your bullet fights is the same if you were shooting to any target on vertical plane. Basically if you built a huge vertical wall that and hung targets at all different heights and angles from you, the drop would always be the same.</p><p> </p><p>Here's the way Wayne van Zwoll explains it, "If you shoot horizontally, gravity acts perpendicular to the bullet path and thus has a pronounced effect on it. Gravity pushing down on the shank of a bullet is the equivalent of a strong full-value or right-angle wind. If the wind shifts to quarter toward or away from a bullet, it drifts less. Apply that principle to bullets fired at uphill or downhill angles, and you would expect less drop as gravity is forced to act obliquely. Think of a bullet fired straight up or straight down. In the absence of wind, neither would scribe an arc. The tug of gravity would be parallel to the line of the bore, so there'd be no reason for the bullet to deviate from a straight path. A bullet fired straight up would travel until gravity and drag pulled it to a stop; then it would decend. The earth's spin would prevent the bullet from landing where it was launched, but touchdown would be very close to that spot....</p><p>At any shot angle between horizontal and vertical gives you flatter trajectory than if you'd fired horizontally, wether you're shooting up or down. The effect of gravity on bullet speed- its pressure on noce or tail- is negligible. So you can hold the same, wether shooting up or down. But that hold will differ, especially at long range, from the hold you would want for a horizontal shot. Simply put, you want to aim as if the shot distance were the same as the horizontal component of the shot."</p></blockquote><p></p>
[QUOTE="landcbeitner, post: 186830, member: 10214"] My grandfather and father taught me from an early age that gravity pulls straight down toward the center of the earth, if I shoot straight up the bullet will not have any drop. gravity can only pull the bullet straight down so if you shoot steep up or down the gravity your bullet fights is the same if you were shooting to any target on vertical plane. Basically if you built a huge vertical wall that and hung targets at all different heights and angles from you, the drop would always be the same. Here's the way Wayne van Zwoll explains it, "If you shoot horizontally, gravity acts perpendicular to the bullet path and thus has a pronounced effect on it. Gravity pushing down on the shank of a bullet is the equivalent of a strong full-value or right-angle wind. If the wind shifts to quarter toward or away from a bullet, it drifts less. Apply that principle to bullets fired at uphill or downhill angles, and you would expect less drop as gravity is forced to act obliquely. Think of a bullet fired straight up or straight down. In the absence of wind, neither would scribe an arc. The tug of gravity would be parallel to the line of the bore, so there'd be no reason for the bullet to deviate from a straight path. A bullet fired straight up would travel until gravity and drag pulled it to a stop; then it would decend. The earth's spin would prevent the bullet from landing where it was launched, but touchdown would be very close to that spot.... At any shot angle between horizontal and vertical gives you flatter trajectory than if you'd fired horizontally, wether you're shooting up or down. The effect of gravity on bullet speed- its pressure on noce or tail- is negligible. So you can hold the same, wether shooting up or down. But that hold will differ, especially at long range, from the hold you would want for a horizontal shot. Simply put, you want to aim as if the shot distance were the same as the horizontal component of the shot." [/QUOTE]
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