WIND DRIFT: START OF RANGE VS END OF RANGE

[DaveMc]

I agree with that and did some rough calculations on it as mentioned above. I also totally agree with Bryan Litz and also think it is more important to watch for valleys, etc that might funnel the wind through.In fact this data supports that (unless gully is right near target)

However on open range:-

Net result appears to be an almost Linear effect of wind until projectile flight gets low again (last couple hundred yards) and particularly last 100 to 200. Of course this depends on actual range profile, flag heights etc.

e.g (I will use your own figures) wind of 12mph in the flags on flat open range. 10mph wind at 1 metre and (assume) similar at mound height as mounds will be slightly elevated. According to JBM Bullet flight never gets over 103 inches (2.6 metres) above line of sight between mound and target so I will also assume peak wind is 12-13 mph and bullet flight goes through or just above flag tops.

Taking this sort of wind into account the figures I have given in the opening paragraph would approximately be more like this:

YDS Height Wind Wind Drift
0 -2.1 10mph
100 28.7 10.5mph 11.14
200 55.0 11mph 11.6
300 76.4 11.5mph 11.8
400 91.9 12mph 11.6
500 100.8 12.5mph 12.0
600 102.0 12.5mph 10.8
700 94.3 12mph 9.0
800 76.0 11.5mph 6.9
900 45.4 10.5mph 4.4
1000 0.0 10mph 1.6

As you can see it is fairly even for the first 7-800 yards.