I have a bullgrey x whippetgrey he is only 11months old at the moment and the first bull x ive had,hes cought 20 odd rabbits so far prob half of what hes chased which for me is a decent catch ratio about my way were rabbits are thin on the ground and run like rockets although i have been carefull which rabbit he runs , at the moment i dont think he is any better or worse than any of the other xs ive had