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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Trajectory Angle at Impact Calc.
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<blockquote data-quote="LouBoyd" data-source="post: 496300" data-attributes="member: 9253"><p>Here's an example of calculating the terminal angle of a 300 Win Mag shooting 210 Bergers at 2850 FPS MV, Altitude 5800 ft (Where I live). The target is at 1500 yards. </p><p>The computer program I used to get the bascic trajetory table was "Quicktarget" the companion progrom to Quickload> Most ballistic programs will work. </p><p>I set the range increment to 10 yards. and the distance to 1510 yards To determine the angle at 1500 yrds: </p><p> It</p><p>distance drop </p><p>1490 yards 1065.8"</p><p>1510 yards 1108.7"</p><p></p><p>convert the differences to the same units:</p><p>20 yards x 36 in/yd is 720 inches </p><p> 1108.7" - 1065.8" = 42.9 inches drop over the 20 yard distance centered at 1500 yards.</p><p></p><p>divide the drop by the distance</p><p>42.9 divided by 720 is 0.0596 (a dimensionless ratio)</p><p>Take the arc-tangent (aka inverse tangent) of the ratio of drop to distance at the target.</p><p>ATAN (0.0596) = 3.41 degrees above horizontal.</p><p></p><p>I don't know of an accurate shortcut.. The needed inputs are only bullet BC, muzzle velocity, Distance, and air density for a horizontal shot. Its more complcated for uphill or downhill shots. </p><p></p><p>For every trajectory which will hit the target there is a second high angle trajectory which will also impact the target for the same bullet fired with the same muzzle velocity. It will hit the target with a higher angle (up to 90 degees for close tragets). It will always carry lower energy and have a longer time of flight. It's not very </p><p>useful for hunting.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 496300, member: 9253"] Here's an example of calculating the terminal angle of a 300 Win Mag shooting 210 Bergers at 2850 FPS MV, Altitude 5800 ft (Where I live). The target is at 1500 yards. The computer program I used to get the bascic trajetory table was "Quicktarget" the companion progrom to Quickload> Most ballistic programs will work. I set the range increment to 10 yards. and the distance to 1510 yards To determine the angle at 1500 yrds: It distance drop 1490 yards 1065.8" 1510 yards 1108.7" convert the differences to the same units: 20 yards x 36 in/yd is 720 inches 1108.7" - 1065.8" = 42.9 inches drop over the 20 yard distance centered at 1500 yards. divide the drop by the distance 42.9 divided by 720 is 0.0596 (a dimensionless ratio) Take the arc-tangent (aka inverse tangent) of the ratio of drop to distance at the target. ATAN (0.0596) = 3.41 degrees above horizontal. I don't know of an accurate shortcut.. The needed inputs are only bullet BC, muzzle velocity, Distance, and air density for a horizontal shot. Its more complcated for uphill or downhill shots. For every trajectory which will hit the target there is a second high angle trajectory which will also impact the target for the same bullet fired with the same muzzle velocity. It will hit the target with a higher angle (up to 90 degees for close tragets). It will always carry lower energy and have a longer time of flight. It's not very useful for hunting. [/QUOTE]
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Trajectory Angle at Impact Calc.
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