Certain embodiments of the disclosure may include systems and methods for calculating the wind deflection of a rifle bullet using concentric scales. The scales are marked radially on each side, one side pertaining to wind speed and the opposite side pertaining to wind direction. The scales of one side include indicia of deflection at various wind speeds, and the scales of the other side include indicia for various wind directions. Using both sides together and in sequence, correction can be made for both wind speed and wind direction.