It all depends on how it patterns. I have used #4 buck with good effect out to 50 yards and farther, especially when hunting over hounds where just getting a couple pellets into it will allow the dogs to catch the yote. I used to shoot them out of a patternmaster choke tube and got really good patterns out to 50 yards. With the dead coyote 3.5" shells the patters were even better and might expand your range a few more yards. I haven't used the heavy shot on very many coyotes but the three that I did shoot were DRT, and were at pretty long range.