Hmm, I'm not really sure on this one, so feel free to take it with a whole shaker of salt, but, just to offer a suggestion, it seems to me what you want, genetically, is a Buff Orp with the dilute factors removed so that the bird is red. So, I'd say you'd want to stay away from black and use the red roo over buff hens, selecting for female progeny that don't have the champagne blond (Cb) and/or the diluting genes (Di) that keep them from being red. If I'm thinking right, though, these genes are dominant, so it might take another generation of breeding his daughters back to him before you'd get red birds. As I understand it (and my understanding is far from perfect, so anyone feel free to correct me on this) once these dominants are removed, and it'll be easy to see if they are, you should have true-breeding reds. Anyway, that might be the most direct route. For what it's worth. And I sure hope I'm not steering you wrong. Maybe someone else will chime in.