IF YOU HEARD A LOUD BOOM SATURDAY EVENING, SHERIFF’S OFFICIALS SAY IT WAS NOTHING TO WORRY ABOUT. THE blast heard or felt from south of Shepherd to north of Clare and from Rosebush to Coleman was most likely caused by an exploding firearms target. Tannerite TARGETS explode when hit by an object traveling at a high velocity. It is legal to use, available at gun stores and has no restrictions.