OK 223 is weak for coyotes but every one running off? how many did you shoot? don't get me wrong I do need some finishing shots on coyotes too. but I normally only outright loose maybe 1 or 2 a year and that is because I am more hesitant to put finishers in them. a facing solid chest hit aught to dump them. I mean sure go 308, but there are other options if you can go 243 in AR 10 that would also be an upgun situation.
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LONG LIVE THE GREAT GHOST OF THE HIGH DESERT.........THE COYOTE