.17HMR is surpassed in kill power by the .22HMR so why bother with it if you have a 22hmr.
The .17HM2 is completely different to the .22lr. Firstly its a further reaching flatter shooting round than the 22lr BUT its a lot louder
The 17hm2 has no ability to shoot subsonic with any knock down.
If cost is to be ignored then I'd go for the 17HMR because it is the flatter of the two and i like the idea of point and shoot ammo.
In Ireland i have heard of boyo's taking rabbits out as far 200yards with a .17HMR......Know that sounds like a bit of craic
PS I'm new so go easy or at least be humane