I have been using my Browning A-bolt .243 for Coyote Hunting and it has reached out a few times and knocked down several Coyotes,trouble is I'm using 100 grain Hornady shells and have hunted Deer with it also so I don't intend on dropping down to a lighter grain bullet.I'm considering a CZ-USA model 527 in the American or Varmint in the .204.This is a great long range Rifle and it has some pretty good knock down power with the Sierra Blitz King 39 grain bullets it will do some serious damage.The .223 Rifle with a lighter bullet is going to reach out pretty far also and have some good knock down power with say a 40 to 50 grain bullet...as far as the .17 HMR I think it is too light a caliber to take down a Coyote or Bobcat?