well not trying to be mean or anything but this has been beat to death in here but my opinion is either the .22mag or the 17hmr will do a coyote out to a 100yards or so if you hit them right i have shot 6 coyotes with a 17 and all have been 1 shot kills but i would shoot them in the head with a 17 they will drop like a rock but the combo gun if you can afford it would be best but if not for under 300 you could have a bolt action savage with a accutrigger in either rimfire caliber with a good scope