There are several sub-species of coyotes and they can vary greatly in size from one area of the country to another. Here in the midwest they vary a great deal from one season to another, in the thickness of their coats. I have a couple of WMA's that are shotgun only and I use #4 buck, however these areas have dense cover and the shots are usually 50yrds or less (IF, you can sucker them in that close).