Bro Keith,
I'd suggest the 62 grain Barnes Varmint grenade. I have not tried them yet myself but am planning on it. They are a frangible bullet that should not exit a coyote but expend all their energy inside the animal while the bullet disintegrates.
Here's what Barnes says about them:
Expending its energy early, the Varmint Grenade seldom exits large predators like bobcats and coyotes, leaving valuable pelts virtually undamaged.
http://www.barnesbullets.com/products/rifle/varmint-grenade/Maybe others have had experience with these and can confirm or deny Barnes claims.