INJURED EMPLOYEE WAS LOADING & CO-WORKER WAS FIRING AN 8-GAUGE INDUSTRIAL SHOTGUN. AS ONE OF THE SHELLS WAS FIRED, METAL FRAGMENTS OF THE CASING ESCAPED THE GUN'S BREECH & STRUCK THE LOADER IN HIS RIGHT HAND. THESE FRAGMENTS WERE EMBEDDED NEAR HIS MIDDLE FINGER KNUCKLE. THE SHELL WAS DEFECTIVE- AN UPSIDE-DOWN BASE WAS IS SUSPECTED.