the 55gr Nosler in my old .223 drt on every shot in the head, neck and chest. One ran 30 some yards dead, one I hit a half inch from bottom of chest she died 50yds after hit. Those 2 were the only ones that didnt drt, out of more than a hundred coyotes shot with that bullet by me. I tried the 40 gr Nosler in my T.20, at first they seemed good, then I started getting massive exit holes under 200yds. One was a 12" long slit cut on side of a big male coyote.
35gr Berger is the best one I found for the T.20, it should be good for the .223, too