A B767-300 INCURRED A TAIL STRIKE AND CREW WAS UNCERTAIN WHEN IT OCCURRED. CREW SUSPECTS THE CALCULATED WT WAS IN ERROR AS ACFT PERFORMANCE WAS SLUGGISH IN CLB.

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FLT OPERATED AS ACR X; ABC; FEB/TUE/02; ZZZ1-ZZZ2 IN A B767-300 SERIES ACFT. I WAS PIC AND PF. EXCEPT AS NOTED BELOW; FLT WAS UNEVENTFUL. SINCE I WOULD BE PNF ON NEXT LEG TO ZZZ2; I DID WALKAROUND INSPECTION AND NOTED SCRAPED PAINT AND 1 INCH SCRATCHES ON AFT PART OF TAILSKID. AFTER VERIFYING WITH FO THAT TAILSKID HAD BEEN CLEAN AT ZZZ1; I NOTIFIED ZZZ MAINT AND MADE A LOGBOOK ENTRY. CARGO AND CONTAINERS HAD BEEN REMOVED IMMEDIATELY AFTER ARR; SO NO WT AUDIT WAS POSSIBLE. MAINT INSPECTED ACFT; FOUND NO FURTHER DAMAGE; AND RELEASED ACFT TO SVC. DIGITAL FDR WAS REMOVED FOR ANALYSIS AND REPLACED. FLC WAS REMOVED FROM NEXT 2 LEGS PENDING RESOLUTION OF MATTER AND A LINE CHK OF MYSELF BY A LINE CHK AIRMAN. LCA NOTED NO DISCREPANCIES IN FLYING OR PROCS TO ME; AND WE COMPLETED THE REST OF THE ROTATION OF FLTS AS SCHEDULED. BOTH PLTS WERE SURPRISED TO SEE SCRAPED PAINT; AND I AM UNABLE TO STATE FOR CERTAIN WHEN IT OCCURRED ALTHOUGH I BELIEVE IT WAS MORE LIKELY DURING LNDG THAN TKOF. FOLLOWING IS A REVIEW OF PERTINENT DETAILS OF THE FLT: 1) THE FLT WAS DELAYED ABOUT 10 MINS FOR LOADING OF CARGO ON PALLETS AND CONTAINERS. I AM NOT CERTAIN IF THIS WAS INCLUDED ON WT AND BAL PRINTOUT. 2) THE CALCULATED WT WAS 334;200 LBS WHICH WAS THE RWY ALLOWABLE TKOF WT WITH A 3 KT HEADWIND WITH FLAPS 15 DEGS FOR RWY 26L AT ZZZ1. 3) THE ACFT HAD A TKOF ROLL OF ABOUT 6000 FT WITH ABOUT A 5 KT HEADWIND. 4) IN VIEW OF THE WT; I USED A GENTLE ROTATION RATE AND NOTED A SLUGGISH CLB RATE DURING CLEAN-UP. BOTH PLTS COMMENTED ON A 1400-1500 FPM CLB PASSING FL250 AT NORMAL PWR AND SPD AT ISA +1 DEG TEMP. DUE TO MY RELATIVE LACK OF EXPERIENCE IN THIS MODEL OF B767; ABOUT 100-200 HRS; I COULD NOT EVALUATE IF THIS WAS NORMAL PERFORMANCE OR NOT. 5) FMS INDICATED A LNDG WT OF 290400 LBS; NEAR THE MAX STRUCTURAL LNDG WT OF 295000 LBS. 6) THE HAND-FLOWN VISUAL APCH TO RWY 34R AT ZZZ WAS GENERALLY STABLE AT A BUG AIRSPD OF 144 KIAS (KIAS (VREF +5 KTS) EXCEPT THAT I HAD TO MANUALLY ADD ABOUT 300 LBS PER HR PWR TO CORRECT FOR BEING ABOUT 2 KTS SLOW AT ABOUT 500 FT AGL. 7) PWR REDUCTION AND FLARE AT 20 FT RA AT BUG SPD WERE NORMAL; IE; A GENTLE PWR REDUCTION DUE TO FAST SPOOL DOWN OF GE ENGS. ACFT WAS IN TRIM. THE WIND WAS VARIABLE AT 3 KNOTS. 8) TOUCHDOWN WAS QUITE SOFT AT WHICH APPEARED TO BE A NORMAL ATTITUDE. 9) DURING AUTO SPD BRAKE DEPLOYMENT; I NOTED A SLIGHT NOSE UP PITCH. FO NOTED ABOUT 7.5 DEGS NOSE UP ON THE ADI. I LOWERED THE NOSE AND ROLLOUT WAS NORMAL.