Reba: I use mostly 50 grain Nosler Ballistic Tips and 52 grain Berger Varmint bullets in my 223's for Coyotes.
Speed and accuracy aplenty with these - and speed and accuracy in ones bullets kills Coyotes effectively.
Be sure to give the Berger 52 grain Varmint bullets a try if you have time.
Best of luck to you.
Hold into the wind
VarmintGuy