Coyote sniping rifle questions

[crapshoot]

Actually, if I knew where to find one locally I'd be tempted...

Check craigslist

 

[Nonnieselman]

Id just build a 20" 223 with 8 twist. Simple and effective.
Ive got a good 53gr load and a 77gr load.
Covers everything from coyotes to deer.

 

[wildflights]

Dtech .243 WSSM would have done the job, but, as others have said, you risk educating a few at 500.
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Got rifle envy...