always consider the wind on the first 1/3 of the distance, it is the one that has the strongest influence on the drift, i never bother with the one at target, if its been blown off its path in the beginning, you wont hit the target anyways.
Moreover If I estimate 3 winds and directions, ie , 3mph full value at 50m, 6-7mph 1/2 value at 70m mark, and 10mph full value at 130m, now where do you start working your windage?
because of this issue, I would work my windage out from the table according to the 3pmh full value at 50m and be done with it. the next shots will be held off if the wind increases abit. it has worked for me. obviously this wont be of any use if after you dial in the windage for a 3mph full value condition, you let off your shot in a gust, then complain the method doesn't work.
here you go.
http://www.youtube.com/user/flammo69#p/u/5/ud8KmnEAO04
http://www.youtube.com/user/flammo69#p/u/4/5P5aYIp_HAY
http://www.youtube.com/user/flammo69#p/u/3/dY6duzrYiE4