Serious question... how can a chronograph accurately measure the velocity of a string of shotgun pellets at longer ranges?
My understanding is that the screens detect either the leading edge of the shot cup or the leading edge of the dense shot cluster at closer ranges. But at ranges like 40 yards or more, the cup or wad would have fallen way behind, and the shot cloud would be much more dispersed and elongated. In addition, with the optical sky-screen type of chronograph, both screens would have to consistently pick up the same cluster of pellets as they pass in order to get a true reading.
