Someone once said, "The wind blows wherever it pleases. You hear its sound, but you cannot tell where it comes from or where it is going." Now, I've been out shooting on windy days and I know that wind has an effect on the path of the bullet, but how do you compensate for wind, and how can you be sure the speed and direction of the wind is uniform all along the path of the bullet? I'm sure it isn't, but does that matter when you're compensating for wind? Is it trial and error, or are there charts indicating the effect of certain wind speeds on certain calibers or bullets? Is there a reference book, like there's reloading manuals, or is it just what each individual shooter discovers through his/her own experiments?