I shoot a 1000fps .177 pellet gun and I dont really think that it could take down a yote. I wouldn't trust it more than 40 yards on squirrels let alone coyotes, which can be dam tough animals remember.

If your planning on actually making a gun to hunt yotes (which is what I'm asuming from your last post) I would recomend against it unless you know exactly what you are doing.

On another note, why not just buy a .223 or something?