17HMR will kill cleanly out to 150m, 22LR relay only to 75 IMHO (unless your name is Dundee) but with ammo at roughly 1/4 the price it's a costly kill. Used to use it on everything inc possums but I am currently conserving it for longer range rabbits and hares. I do recommend it on Hares as in my experience it kills much cleaner than 22.
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