generally, calling and baiting are done at different times for different reasons. Baiting is not a part of calling, as it is for trapping. For bait to work, it needs to be available at all times for an unlimited amount of time. Calling is "bait" for the ears of the coyote, if a coyote doesn't respond within 30 minutes, it's time to move to a new location, and try again.You need to be able to set up in an area where there are coyotes, and make them show themselves before they smell you. If they smell you before you see them, then you won't see them. If you're thinking about using a cover scent, don't waste your time. Learn how to set up in a way that makes the coyote move into a clearing, that is down wind of you, and at that point is where you need to shoot it, before it crosses your scent cone. Don't under estimate the nose of a coyote, it's much better than a deer and the coyote won't stand around wondering what or where you are!
Your .243 loaded with your choice of ammo. will do just fine!