It all depends on the angle the wind hits the bullet. If the bullet flys thru a wind that is going up the bullet will go up and if the wind is coming down the bullet will drop. Same goes for the direction the bullet is going. In a straight and level head or tail wind if the bullet is rising in its arc in a head wind the bullet will rise more. If it is falling in a head wind it will fall faster. In a tail wind it is not as pronounced but it does just the opposite. You just have to experience it to believe it.