I am not sure that I understand your question. Are you looking for a load for Coyote or waterfowl? Putting steel through a x-full choke is a no no and have never heard of an x-full being aproved for steel but I could very easily be wrong. If you are looking for a coyote load with a shotgun, I would not suggest using steel, I would use buckshot and if that is for some reason not an option then it depends on the distance. If your talkin aboput shooting coyotes within 40 yards, the 4's would be good, it its within 60 yds, I guess you could use the T's but I have never personally heard of using steel on Coyotes but I dont know. IF you are looking for a waterfowl load then u will have to use the steel. As for patternig, I couldent tell you, but steel is usually best shot through a modefied. Like I said, I am not real sure of your question and Im not sure of my answer either.
-Ken