Why just 17 hmr or .223? There are many calibers out there. I own a Ruger 10/17 grey laminated chambered in .17 HMR. The ground squirrels, rabbits, and other small varmints are targeted with it. I have even taken many badgers with this round. But for coyotes, you need to step up the caliber. Personally, I use the .308 round, which many can consider too big, but I find it appropriate for accuracy, knockdown, and reliable trajectory. Some people I know around where I am at use .223, 22-250, .220 Swift, .243, 30/30(lever action for close encounters), and even .338( that would be me a 400 yard plus shots). I really depends if you are up to the hunt. My piece of advice, do not use the .17 HMR, and don't just rely on the .223 beeacuse it is cheap ammo. That is not a wise decision on a long term investment. Choose on what you would be comfortable on, your experience and markmanship, and whether your pocket book allows you to have options.