Using a FMJ is always a crap shoot when it comes to coyotes...weathers its from a .308 or a .223.
You're going to get a lot of clean one shot kills with little pencil hole exit wounds, but dead none the less.
AND, the longer you shoot, the more you'll see those same types of shots hit a bone and send fragments out a hole the size of a soft ball.
AND, then again, you'll have a perfect double lung shot that passes between ribs that will have them run off 500 yards and die of blood loss.
Do they work? Yep...especially if your gun shoots them well, but as said before. Don't expect your bullet to bail you out.
Send them through the shoulder blades for more positive drops, but expect more damage.
If you're using them specifically to keep fur and want minimal damage...expect a lot of runners.