Both will kill rabbits easily. 22LR can be made quiet, 17HMR cannot. It's not the calibres per se, rather the difference between subsonic and supersonic. No suppressor will remove the boom associated with a supersonic round, but they do reduce the noice associated with the bullet leaving the muzzle. 22LR does ricochet quite badly. 22LR is accurate to 75 metres in my hands, but with practice, a good rifle and an understanding of bullet drop, 100 metres is quite realistic.
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