I have been plinking at them at my parents farm with a 22LR Mk II, but crows are cagy and fly if you get too close.
Thinking a 17hmr might be better.

They have a spot where they land on the ground in a feild a lot, so I try to pick them off there, but its usually a 100+ yards so its a difficult shot with a 22LR.

Made me laugh at the supposed head shots at 200 yds with a 22LR by Mark Walberg in the movie Sniper

Got some feathers the other day but thats about all so far.
Also I am thinking a 17hmr bullet should blow up ?? rather than ricochet like a 22LR so it should be safer.