I would say thats probably a "one off" as I have never seen a bull x which was a decent, consistent hare dog. What time of year was the dog catching them and was it during the daytime? Some of the bull/saluki/grey mixes do ok, but they dont usually have a lot of bull in them, just enough to give them that grit and stamina, very unusual to hear of a straight half x bull/greyhound that kills hares regularly daytime
he used to catch them on the lamp about this time of year im not on about catchin imature hare he was a very racey half cross very game there wasent much that got away from him