OK:
An unmoderated .22 with subsonic ammo is nowhere near as loud as a 17hmr in anyway shape or form.
BUT as the others have stated the noise is not really an issue to the Rabbits, I once shot 47 Rabbits in
just over an hour stood in plain sight at 50 yards range using HV .22's, they really didn't seem to be bothered
by my rifle's 'crack' again and again.
However I use my moderated .22 all the time as the local HUMANS can't hear me, and that's the point, these days (sadly)
the country is full of 'a place in the country' Townies, and they don't get it at all when someone with a rifle
a