Shooting on a windy day.

[C-grunt]

I went to the range today with my Savage .308 and was disapointed when I noticed that it was rather windy out. Luckily I was able to get a table right next to the little wind flags and that helped my shooting extremely. I was able to keep a couple groups at around 3/4 moa, even though they were about 2 inches to the right of the bulls eye at 100 yards. These were lucky groups because I was guestamating the proper hold off during the varying wind conditions.
So this leads me to my question. What is the aproximate wind speed for the following flag conditions? The flags are made of about 12 inches of engineer tape.
flag at: 20 degrees, 45 degrees, 60 degrees, and 90 degrees?

 

[hillbilly]

An old shooter's forumla is to look a tthe ange formed between the flag and the pole the flag is on.

Estimate how many degrees that angle is. And then to get the approximate wind speed, divide that angel by 4.

A 40 degree angle divided by 4 equals an approximate wind speed of 10 mph.

In my notebook, with a .308 168 grain bullet, that means about .75 inches of drift in a full value wind.

Full value means going across the line of the bullet's flight at 90 degrees.

There's all sorts of wind reading stuff to be learned.

hillbilly

 

[mndfusion]

I like estamating windage by mirage, I'm sure someone has pics posted somwhere on the net on how to do this! You can judge he winds speed by the angle of the mirage.