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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
wind drift????
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<blockquote data-quote="DMCI" data-source="post: 31338" data-attributes="member: 1730"><p>Lets use a little thing called a engineering reasonableness test.</p><p></p><p>I once shot in an 18 mph wind at 200 yards using a 3.2moa hold and 300 yards with about 5.3 moa in that wind.</p><p></p><p>So that gives us a bench mark.</p><p></p><p>Now you claim 420 yards, wind is 15mph.</p><p></p><p>Chart says 1.4 x 15 = 25" (not 25moa, but 25inches and I'm wrong.) 24" seems OK. The engineering reasonableness test says that is OK after you divide by 420 yards. I was using a 100 grain SVHP 6.5mm which is a terrible wind bucker. (BC is about .220)</p><p></p><p>But 4.75 moa seems reasonable. Too many unit systems!</p><p></p><p>According to the program, its a .308, 175gr, mv=2635, BC=.495, t=59, h=78, Alt=500.</p><p></p><p>My Atrag Horus Palm Software says:</p><p></p><p>Hold up 7.9, into wind 4.7moa</p><p></p><p>Which the simulator puts nearly dead center on the 12x12 plate in stage A.</p><p></p><p>Value should be .313 moa/mph. I don't know why they convert back into inches, which should be only used to measure range. Better to work in MOA which is a unit independant of range.</p><p></p><p>[ 02-04-2004: Message edited by: DMCI ]</p></blockquote><p></p>
[QUOTE="DMCI, post: 31338, member: 1730"] Lets use a little thing called a engineering reasonableness test. I once shot in an 18 mph wind at 200 yards using a 3.2moa hold and 300 yards with about 5.3 moa in that wind. So that gives us a bench mark. Now you claim 420 yards, wind is 15mph. Chart says 1.4 x 15 = 25" (not 25moa, but 25inches and I'm wrong.) 24" seems OK. The engineering reasonableness test says that is OK after you divide by 420 yards. I was using a 100 grain SVHP 6.5mm which is a terrible wind bucker. (BC is about .220) But 4.75 moa seems reasonable. Too many unit systems! According to the program, its a .308, 175gr, mv=2635, BC=.495, t=59, h=78, Alt=500. My Atrag Horus Palm Software says: Hold up 7.9, into wind 4.7moa Which the simulator puts nearly dead center on the 12x12 plate in stage A. Value should be .313 moa/mph. I don't know why they convert back into inches, which should be only used to measure range. Better to work in MOA which is a unit independant of range. [ 02-04-2004: Message edited by: DMCI ] [/QUOTE]
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wind drift????
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