The rationale of softs and solids is based on the probability of the first shot being taken under ideal conditions wherein a shot placement in the vitals is available. The second shot may well be less than ideal if the buffalo has turned or is running away. Under that circumstance, the second shot involves penetrating heavy bone and body mass including muscle and a full gut of grass. once you see the amount of grass in a buffalo's gut, you will understand. Expanding bullets by their very nature, will not penetrate as deep as a solid.
T.S.
