I use a Remington Varmint Synthetic special rifle in .308. I know it' s a bit much, but out here in Cali, the coyote' s do a severe job on the deer population. They are very smart and skeptical, so sometimes I have to reach out and touch them from 200+ yards, it' s nice to have that extra power. It' s also fun to watch them jump about 3 feet in the air when shot with it. I topped it with a tactical Leupold scope with a 50mm lens on it and use Black Hills moly coated ammo.
I figure the less coyote' s, the more deer.
Bryan