Any thoughts on the Federal 50 grain jhp?
Worthless! At least that's been my experience with "ANY" of the 50g 22 magnum loads. they pretty much act like FMJ rounds when fired from a revolver, and not much better fired from a rifle. You'd be a lot better off on a coyote using what Gray Beard said. The old standard Winchester, or CCI 40g HP's would give you a better balance of expansion, and penetration. The hyper velocity loads using lighter bullets expand violently, but absolutely "will not" consistently make it through to the vitals on a broad side shot, much less on a less favorable angle.
Personally, I'd highly advise you to use a little more gun on a coyote. I know that a lot of coyotes have been killed with the magnum using a wide variety of ammo, but I've personally shot a bunch with it, and it performs pitifully compared to the next caliber up the ladder(22 Hornet).
The 22 magnum though, loaded up with something like the 30g CCI TNT HP's is the best "fox" rifle you can put your hands on. In 90% of the ones I killed with this combination, there was only an entry hole, massive internal damage, and rarely an exit.