I coyote hunt quite a bit, and it can be tough. First rule is play the wind. Never call with the wind at your back. If you expect them to come from a certain direction, never set up where they will smell you first. When you start calling, start soft. Call for about 30 seconds to a minute then stop for about 5 minutes. Then call again increasing your volume. Continue this for a half hour. If no coyotes in that time frame, they probably won't show. Be watchful as you exit your hunt site. I have spooked them walking out on several occasions. As far as ammo, I like to use ballistic tip ammo. If you happen to miss, it will blow up much more quickly than a more solid round. If you have learned to use a howler, they can be good as a locator call. Best time to hunt is in the winter, but I have read some experts who think this time of year is good also.