RE: I want to start coyote hunting???
Any centerfire cartridge, like your .270WSM, will work unless you plan on keeping the hides. I don't, since I just hunt for fun/predator control. I use a Circe triple tone predator. It's easy to use and has all three calls I need in one. I watched a couple of videos and then went out with someone on a hunt. After that, I just went out on my own, usually right after sunrise and before sunset, and started calling. The first time or two I went out, I didn't see a thing. Then the next time I called one in. Then two on the next trip. I tried to learn from my mistakes and get a little experience under my belt. You'll get better every time you go out because you'll make mistakes on one trip, and remember not to do the same thing on the next.