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Long Range Hunting & Shooting
Building a personal 1K range. What direction?
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<blockquote data-quote="4xforfun" data-source="post: 1343450" data-attributes="member: 9172"><p>it's been a while since I messed with this stuff, so I pulled out my shooter app and used my 300 WBY with the 210 berger for my test.</p><p></p><p>First we need to come up with a value in degrees for the whole "clock" thing. Head wind to tail wind (0 degrees to 180 degrees) 1 Hr on the clock = 30 degrees. (180 / 6 = 30)</p><p></p><p>Lets use a 10 mph constant wind.</p><p></p><p>three o-clock (90 degrees) @ 10 mph = 5.8 MOA .....58 inches drift.</p><p>two or four o-clock (60 or 120 degrees) @ 10 MPH = 5.0 MOA....50 inches, for a drift change of 8 inches. If it changes back and forth between 2 and 4 o-clock the net change is ZERO.</p><p></p><p>Now lets shoot into (or with) the wind...same...</p><p></p><p>Obviously a 0 or 180 degree wind would produce ZERO wind deflection.</p><p>Change the wind from 6 o-clock to 7 o-clock, we get a 2.9 MOA shift...29 inches. Or...a 7 o-clock to 5 oclock (like the 2-4 oclock) we can double that.....58 inches drift change.</p><p></p><p>Or, a 1/2 hr switch...from 6 to 6:30 = 1.5 MOA...15 inches. That same 1/2 hr at full value....from 3:00 to 3:30 = a TWO INCH CHANGE......NOTHING.</p><p></p><p>I won a 600 yard BR match once by being the only one NOT to DQ! Strong head wind. Had that been a strong cross wind we all would have had the wind dialed in during the sighter period.</p><p></p><p>Just stirring the pot,</p><p>Tod</p></blockquote><p></p>
[QUOTE="4xforfun, post: 1343450, member: 9172"] it's been a while since I messed with this stuff, so I pulled out my shooter app and used my 300 WBY with the 210 berger for my test. First we need to come up with a value in degrees for the whole "clock" thing. Head wind to tail wind (0 degrees to 180 degrees) 1 Hr on the clock = 30 degrees. (180 / 6 = 30) Lets use a 10 mph constant wind. three o-clock (90 degrees) @ 10 mph = 5.8 MOA .....58 inches drift. two or four o-clock (60 or 120 degrees) @ 10 MPH = 5.0 MOA....50 inches, for a drift change of 8 inches. If it changes back and forth between 2 and 4 o-clock the net change is ZERO. Now lets shoot into (or with) the wind...same... Obviously a 0 or 180 degree wind would produce ZERO wind deflection. Change the wind from 6 o-clock to 7 o-clock, we get a 2.9 MOA shift...29 inches. Or...a 7 o-clock to 5 oclock (like the 2-4 oclock) we can double that.....58 inches drift change. Or, a 1/2 hr switch...from 6 to 6:30 = 1.5 MOA...15 inches. That same 1/2 hr at full value....from 3:00 to 3:30 = a TWO INCH CHANGE......NOTHING. I won a 600 yard BR match once by being the only one NOT to DQ! Strong head wind. Had that been a strong cross wind we all would have had the wind dialed in during the sighter period. Just stirring the pot, Tod [/QUOTE]
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Building a personal 1K range. What direction?
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