Beavers can get up to 60 lbs or so, almost twice the weight of coyotes. I'd think you would probably want to use a .22 hornet or .223, though a .22 mag should work if placed in the vitals, and probably work better than a .17hmr. For head shots, .22lr will work. I hear they're good eatin - I intend to find out for sure next time I kill one.
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