A B767-300 MADE A HARD LNDG WITH A TAIL STRIKE AFTER A NORMAL APCH. ACFT CARGO WAS LOADED TAIL HEAVY.

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WE WERE FLYING A NIGHTTIME VISUAL APCH. THE WX WAS CAVOK AND THE APCH WAS STABLE AT 1000 FT AND 500 FT. AT APPROX 400 FT; AIRSPD DECREASED 3-4 KTS AND THE FO ADDED PWR TO CORRECT. WE CROSSED THE RWY THRESHOLD AND NEITHER THE PF NOR MONITORING SENSED AN UNUSUAL DSCNT RATE. RADIO ALTIMETER CALLS SEEMED NORMAL. THE ACFT LANDED HARD IN THE TOUCHDOWN ZONE AND BOUNCED. I ASSISTED THE FO WITH THE FLT CTLS; AND ADDED THRUST. I WAS ATTEMPTING TO SOFTEN THE SECOND LNDG WITHOUT INCREASING PITCH. THE SECOND TOUCHDOWN SEEMED NORMAL. NOTHING UNUSUAL WAS NOTED ON ROLLOUT OR TAXI IN. AFTER BLOCK IN; A HARD LNDG RPT WAS ENTERED INTO THE LOGBOOK. POSTFLT INSPECTION REVEALED THAT THE TAILSKID HAD BEEN STRUCK ON LNDG. IN REVIEWING THE APCH WITH THE FO; WE FELT THAT WE FLEW THE APPROPRIATE AIRSPDS AND FLAP CONFIGN. IT'S DIFFICULT TO DETERMINE EXACTLY WHAT HAPPENED BECAUSE THE APCH SEEMED NORMAL UNTIL IMPACT. I HAVE CONSIDERED THE POSSIBILITY OF INCORRECT FLAP OR AIRSPD SETTINGS BUT WE CAN'T BE SURE UNTIL THE DFDR INFO IS REVIEWED. WE WERE LOADED WITH AN AFT CTR OF GRAVITY AND THAT MIGHT ALSO BE A CONTRIBUTING FACTOR TO THE TAIL STRIKE.