Interestingly - old .22 rimfire packets carry a warning on the inner flap that says " Dangerous within a mile and a half " so your suggestion of 1000 metres is well off.
On a cost-alone basis the .22 rimfire is a way better bet for the sort of casual usage you suggest - there are many very good second hand rifles out there , ammo is available ( and economical) everywhere , and you can shoot hyper-velocity , normal LR , standard velocity , shorts , subs out of the same rifle , whatever suits your purposes.
I use a 17 Mach 2 at present but ammo is 25 bucks a box ........ only using it because I have a lot of ammo available , and it suits my purposes currently.
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