I've used Sierra 55 grain soft points and hollow points without explosive exits. I try to shoot the coyote head on just below the neck every coyote I've shot this way with the .223 has never left an exit wound. I've had good luck as well well with the Sierra 63 grain soft points and saving the fur. My advice use the heaviest bullet that your rifle will stabilize and shoot well.
http://www.sierrabullets.com/index.c...ts&caliberID=3