black Limo and black simmental are by definition crossbreds, the black gene did not exist in either breed until introduced through either angus or black baldies. On paper all Angus trace to their Scottish ancestors, in all probability there are some that likely do not in practice. The Wye cattle were a major source of size when the fashions changed in the late 60's, Wye cattle were never small, however by todays standards many people would call them smaller framed, Wye didn't change but the breed sure did. Many herds in the western states (montana in particular) were at the forefront of performance testing in the late 50's and early 60's, again they never did make the cattle belt buckle and served as a resource for larger genetics when the time came, as did western Canadian herds. Frame score is probably the easiest single trait to select for if you ignore every other consideration so progress can be very rapid, in either direction up or down.