I came out of work at app. 1125pmest on break. east side of parking lot. saw first object through trees app. 20 degrees moving towards me. thought it was work helicopter, then app. 5 sec later 3 more objects came behind first one. hurried and snapped 2 pictures while walking towards middle of parking, heading east. thought then it was drones but objects made no noise and started turning south while ascending to app. 250-300ft. snapped another picture from middle of parking, looked to see if anyone else was out there, heard voices but didnt see anyone. started recording video then and continued walking towards end/ back of the east parking area. thats when 5th object appeared still from east but this one was heading more sw, 4 object were now heading south, at this time heard what sounded like a shotgun. stopped recording, got in car pulled on work road and started driving down bacck side of work heading south, objects were now about 500 to 750 feet up, there was low clouds moving through area at this time, 5th object was still catching up to other 4, i was looking out left side driver window, trying to get to darker area of work, object moved higher into clouds. there was no erratic movement, thought maybe they might have been chinese lanterns. they moved smooth and when they turned south still maintained stright line movement but gradual ascension. didn't get opportunity to record again, whole episode lasted between 5 to 10 minutes, about 1/8th of a mile east is open grazing field areas, maybe 1/4 mile is cow fields, all east and south of where i work. airport is further east, about 2 miles. wasnt windy out, light breeze, about 42 degrees f. went back into work, showed coworkers pictures and video, asked what they thought, all said not drones or lanterns, or plane or helicopter,