First question is why a 17HMR?
Forgetting that for now.
The CZ 455 is a very accurate rifle. Comes in a variety of configurations and rimfire calibers. I have shot more than one and find them accurate and forgiving of technique, hard hold vs soft hold etc..
The same for the Savage 93 series except that I find them very sensitive to hold. Light hold seems best but change in hold will change POI.
Ruger 77 series rimfires are better than I would have would thought. I've said it before, when I was young if you tried to talk me into a Ruger, I would have told you to take a hike. Now completely different world.
Ruger American Rimfire. I'm gonna go for it for Christmas. I have everything else I could possibly want or parts to make it from so time for something different.