I have used # 4 Buck for over 40 years in all sizes 2 3/4, 3 and 3 1/2 inch, and have had very good results. How ever I limit my shots to the appropriate yardage for the Round I am using. But I always pattern my Gun,with the Rounds I hunt with.
Howerver my favorite Coyote Load is # 2 Heavy Shot Goose Load, it is and awsome Round.