I have a CZ455, beauty of it is I picked up the 3 barrel combo, so one gun 3 calibers .22LR, .22WMR, .17HMR
I tend to run the .17HMR the most, from the bench in zero wind I'll get thumbnail sized groups at 100m, its a fantastically accurate gun, and the 17gn CCI A17 rounds run great,
Shot over a chronograph last week, 16 shots average Velocity was 2683 FPS,
But that said cost of the .17HMR Rounds can be up around 65-70 cent per round compared to a 22lr its a lot more expensive to run.
But in bulk cheep .223 isn't much more expensive than your .17hmr rounds, but far less issues with wind.
If your hunting rabbits for pest control and not worried about mincing the meat, I'd skip past the .17 and jump up to a .223.
Bookmarks