A .223 out to 300 yards just has a little more going for it in my experiences. And more bullet choices. Having run both for coyotes, I did have a few runners with a .204 and the .223 but for coyotes to 300 yards, a .223 and a 55 grain Vmax is a match made in heaven. If you choose a .204, I'd run the 40 BT, or the 35 or 40 grain Berger...
55 grain BT's at .223 starting MV's will exit more often than not and you will have some runners that shouldn't be running more than likely. Vmax's work better at .223 velocities, at the least the 50, 55, and 60 grain offerrings, than do BT's in my experiences. BT"s are more tailored for .22-250 MV's for putting down coyotes quick.
YMMV...
