The best way to learn how to read wind is to go shoot with your local provincal rifle ass. There are members out there that have been shooting for 3 time as long as I have been alive. They are old and they use open sights and a goofy shooting jacket and the hat you have to laugh at the hat. But they have the info that we are looking for and they will tell you, you may have to play there game (TR shooters) they shoot 308, longrange + tac + hunters all use 308. you trying to read the wind for a shot on a deer, gopher, or steal plate at 900yrds is the same as them trying to hit the big back blob at 900yrds. I have been there those guys will hit the blob faster and more often then you with a scope..
there is alot to learn, shooting to the only way to learn. forget buying more books and go shot with a pro!