i use a 223 for coyotes, 180 yards is the farthest ive shot one. I use winchester supreme 40 gr ballistic tips. very accurate round out of my Rem 700 VSSF and every coyote ive shot goes down quick,,, one shot is all ive ever needed with that brand of ammo.
most shots are way under 100 yards most of the time, especially here in IL, your in KY? i would think calling spots would be "tight" there as well.. lots of farms all around, fence rows, timber lines etc...
I think the 223 is a great coyote gun..but 300 yard shots are pretty rare in my neck of the woods, most places i call dont have a 300 yard shooting lane..usually a hill or tree lined creek bottom is in the way,, good luck with whatever you choose but dont shy away from the 223 if you find a deal on one. that tikka t-3 or cz 527 in 223 would make a good carry gun, my Rem, vssf is a bit heavy, but its too accurate to trade away.