A 25/06 is the only thing that you are aloud to use. 25/06 is pretty dang big for a coyote. If you could try and use something smaller like a .223 aclly improved, .204 ruger, .17 rem, .220 swift, or maybe even a 12 guage with some 00 buck will work, buta 25/06 is a lot of gun for a yote. And it will do some pretty heafty pelt damage no matter what type of bullets.