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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Help Needed with LB3.0 and .338 Bergers
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<blockquote data-quote="Pdvdh" data-source="post: 398091" data-attributes="member: 4191"><p>Don't hold my feet to the fire; but <u>a 90* and 270* azimuth shot will be affected by Coriolis-induced bullet climb or fall</u> (vertical change in dope), in addition to the horizontal drift. The horizontal drift is the same no matter which direction you shoot, and is based soley on your location in degrees North Latitude. Vertical dope is unaffected with a dead north 0* azimuth and a dead south 180* azimuth. Shifting azimuth either easterly or westerly from due north or south will affect vertical Coriolis-caused dope, with the maximum dope required when firing due east and due west. Shooting due west will result in a lower Coriolis-caused bullet POI; requiring additional elevation dope. Shooting due east will result in a higher Coriolis-caused bullet POI, requiring less elevation dope.</p><p></p><p>Play with this on your LB program and I believe I have relayed these Coriolis affects on bullet flight correctly. Plug in a 1000 - 1500 yd range and 0* azimuth. Turn coriolis on and off and elevation dope should not be affected. Then enter a 90* azimuth and turn coriolis on and I believe elevation dope will be reduced. Try the same with azimuth = 270* and coriolis turned on should increase vertical dope. Try the 180* azimuth and coriolis should not affect vertical dope.</p><p></p><p>I don't have LB with me at the moment or I would confirm this first. But I'm pretty sure. If this is wrong, post back here and notify me I'm the one full of the dope! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p><em><u>PS</u></em>: No matter what you decide on spin drift, I highly recommend the inclusion of Coriolis drift when using LB3 at long yardage, because Coriolis bullet drift, climb, and fall is as well documented and modeled as gravity. I recommend spin drift also, based on my testing and experiences. But I am led to believe that pinpoint accurate modeling of spin drift is a bit more elusive than the modeling of Coriolis drift.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 398091, member: 4191"] Don't hold my feet to the fire; but [U]a 90* and 270* azimuth shot will be affected by Coriolis-induced bullet climb or fall[/U] (vertical change in dope), in addition to the horizontal drift. The horizontal drift is the same no matter which direction you shoot, and is based soley on your location in degrees North Latitude. Vertical dope is unaffected with a dead north 0* azimuth and a dead south 180* azimuth. Shifting azimuth either easterly or westerly from due north or south will affect vertical Coriolis-caused dope, with the maximum dope required when firing due east and due west. Shooting due west will result in a lower Coriolis-caused bullet POI; requiring additional elevation dope. Shooting due east will result in a higher Coriolis-caused bullet POI, requiring less elevation dope. Play with this on your LB program and I believe I have relayed these Coriolis affects on bullet flight correctly. Plug in a 1000 - 1500 yd range and 0* azimuth. Turn coriolis on and off and elevation dope should not be affected. Then enter a 90* azimuth and turn coriolis on and I believe elevation dope will be reduced. Try the same with azimuth = 270* and coriolis turned on should increase vertical dope. Try the 180* azimuth and coriolis should not affect vertical dope. I don't have LB with me at the moment or I would confirm this first. But I'm pretty sure. If this is wrong, post back here and notify me I'm the one full of the dope! :) [I][U]PS[/U][/I]: No matter what you decide on spin drift, I highly recommend the inclusion of Coriolis drift when using LB3 at long yardage, because Coriolis bullet drift, climb, and fall is as well documented and modeled as gravity. I recommend spin drift also, based on my testing and experiences. But I am led to believe that pinpoint accurate modeling of spin drift is a bit more elusive than the modeling of Coriolis drift. [/QUOTE]
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Help Needed with LB3.0 and .338 Bergers
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