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7.62x39/.223If that is what you got, or what you want to use, head shots. (imho)P.S. .223 is a no-go for Washington on big game. .243 or larger.
particularly coyotes
If you are using it in an AR15 and you handload 110 - 125 grain 308 bullets, you would be amazed how accurate the caliber can be. If you are using it in an AK style your accuarcy will likely be dismal to say the least. AK's have a .311 bore but the better .308 bullets will work very well, so what you end up with is basically a 30-30 semi-auto. Should work good out to 200 yards in other words.