Sorry for the delay, and please find below the comparison shot of young Master Stompy, mounted on a 50mm washer, going postal on some ruddy colonialists, from left to right: Pulp Figures, Wargames Foundry, Copplestone Castings.
As said, he may not be tall enough for a full-grown bull, but I still think it is an excellent sculpt. The North Star African animals (those which I have seen so far, e.g. buffalo) are also very good, but for the smaller ones (antelopes etc.), I think the Ral Partha ones are still the most lifelike, and a herd of their antelopes would look smashing (apart from the limited number of poses).
Be advised, though, that my casting (bought in 2010, IIRC) had a rather prominent mouldline running along its back and down the ears, which may take some work. The tusks are separate and should be posed carefully to avoid looking derpy.