i don't shoot as many as some, but i kill my share of coyotes. i cannot recall EVER losing a coyote that was shot in the chest. gut shots, yes. back legs, yes. front legs, yes. But, NEVER on a front on shot or a broadside chest shot.
It is rare, but it does happen where a coyote will make it 20 or 30 yards with a chest shot, maybe just clipping the bottom, or a little far forward.
In the 18 years i have been hunting coyotes, i have used FMJ's (first coyote), hornady soft points, winchester power points, remington soft points, 60gr sierra, and maybe some others. But, once I started using 55gr v-max, i have had almost no reason to look any further. A 55gr v-max in the rib cage either from the front or the side, results in a dead coyote that almost always drops in its tracks. front on shots are best for hide damage, guaranteed no exit.