hi mate , pigeon's will race on any system , be it widohood , double widohood , round a bout , celebcy , natural , dry , and manny more system's that can be used , the world is your oyster as system's go , it come's down to what you set your stall out for , sprint , middle , long , horse's for course's , i know where you are comming from , in that you need bird's to be in with a chance at 100ml & do a turn at 500ml , bird's of that sort are hard to come by, no matter what name they go by , you are wright widohood has been raced in the uk for some 70+ year's ,