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<blockquote data-quote="Brent" data-source="post: 7545" data-attributes="member: 99"><p>700,</p><p></p><p>It's really splitting hairs but, using your bullet and speed I come up with something a bit different. </p><p></p><p>175gr SMK at .505 BC at 2700 fps.</p><p></p><p>Where you get:</p><p><strong>100 Yard press. adjust. for 7000ft alt. = +0.28MOA</strong></p><p></p><p>At 100yds I get .02" less drop at 7000ft ASL(2.49" total drop to 2.47"), not +.28". From a BP of 29.53in HG to a BP of 22.75in HG or a BC that goes from .505 to .6565. </p><p>A +.28" POI seems out of place, doesn't it?</p><p></p><p>At 0 ft. ASL and at 100yds I get .01" more drop from a temp change of 59deg F to 34deg f, or a BC that goes from .505 to .4792</p><p></p><p>A combined change from 0 ft./ 59deg F/ 29.53in HG to 7000 ft./ 34deg F/ 22.75in HG resulted in a drop from:</p><p>100yds = 2.49" to 2.47". </p><p>1000yds = 411.09" to 362.64"</p><p>A change of .1174 BC (.505 BC to .6224 BC)</p><p></p><p></p><p>A drop of 25deg alone at 0 ft. ASL results in a change of drop from; </p><p>100yds = 2.49" to 2.50"</p><p>1000yds = 411.09" to 423.30</p><p>a change of .0258 in BC. (.505 BC to .4792 BC)</p><p></p><p>At 7000 ft. ASL the same temp drop results in a change of drop from;</p><p>100yds = 2.47" to 2.47"</p><p>1000yds = 355.21" to 362.64" </p><p>a change of .0341 in BC. (.6565 BC to .6224 BC)</p><p></p><p></p><p>At 0 ft. ASL and 59deg F. a change in BP from 29.53 to 22.75 would result in a change of drop from;</p><p>100yds = 2.49" to 2.47" </p><p>1000yds = 411.09" to 364.63" </p><p>a change of .1169 BC (.505 BC to .6219 BC)</p><p></p><p>At 0 ft. ASL and 34deg F. a change in BP from 29.53 to 22.57 would result in a change of drop from;</p><p>100yds = 2.50" to 2.48" </p><p>1000yds = 423.30" to 371.02"</p><p>a change of .1159 BC (.4792 BC to .5951 BC)</p><p></p><p>Food for thought. <img src="http://images/icons/smile.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The real ****er is these drags are based on a G1 drag curve, not the G5 which better models this bullets form, a custom drag model with the 175 SMK's exact form as the basis would be even better. <img src="http://images/icons/wink.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>[ 10-20-2003: Message edited by: Brent ]</p></blockquote><p></p>
[QUOTE="Brent, post: 7545, member: 99"] 700, It's really splitting hairs but, using your bullet and speed I come up with something a bit different. 175gr SMK at .505 BC at 2700 fps. Where you get: [B]100 Yard press. adjust. for 7000ft alt. = +0.28MOA[/B] At 100yds I get .02" less drop at 7000ft ASL(2.49" total drop to 2.47"), not +.28". From a BP of 29.53in HG to a BP of 22.75in HG or a BC that goes from .505 to .6565. A +.28" POI seems out of place, doesn't it? At 0 ft. ASL and at 100yds I get .01" more drop from a temp change of 59deg F to 34deg f, or a BC that goes from .505 to .4792 A combined change from 0 ft./ 59deg F/ 29.53in HG to 7000 ft./ 34deg F/ 22.75in HG resulted in a drop from: 100yds = 2.49" to 2.47". 1000yds = 411.09" to 362.64" A change of .1174 BC (.505 BC to .6224 BC) A drop of 25deg alone at 0 ft. ASL results in a change of drop from; 100yds = 2.49" to 2.50" 1000yds = 411.09" to 423.30 a change of .0258 in BC. (.505 BC to .4792 BC) At 7000 ft. ASL the same temp drop results in a change of drop from; 100yds = 2.47" to 2.47" 1000yds = 355.21" to 362.64" a change of .0341 in BC. (.6565 BC to .6224 BC) At 0 ft. ASL and 59deg F. a change in BP from 29.53 to 22.75 would result in a change of drop from; 100yds = 2.49" to 2.47" 1000yds = 411.09" to 364.63" a change of .1169 BC (.505 BC to .6219 BC) At 0 ft. ASL and 34deg F. a change in BP from 29.53 to 22.57 would result in a change of drop from; 100yds = 2.50" to 2.48" 1000yds = 423.30" to 371.02" a change of .1159 BC (.4792 BC to .5951 BC) Food for thought. [img]images/icons/smile.gif[/img] The real ****er is these drags are based on a G1 drag curve, not the G5 which better models this bullets form, a custom drag model with the 175 SMK's exact form as the basis would be even better. [img]images/icons/wink.gif[/img] [ 10-20-2003: Message edited by: Brent ] [/QUOTE]
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