The one true "pelt saver" that hasn't been listed here is the .17 Fireball, Its the best as far as belt damage goes on foxes and coyotes, its more than enough for a fox, but still enough to do a Coyote in.
Friend of mine just got back from Texas and he emailed me a picture of the harvests, there was a Gray fox hit with a .204 it about cut it in half. way too much gun. Same with a .22-.250 I have a .22-.250 for predators but it only gets the nod when I'm targeting Coyotes, I'd sit down and take a long look into a .17 Fireball before you make any decisions, especially for foxes and coyotes.
Ryan.