AN LTT CREW; DEPARTING LAX; REALIZED THE CTR OF GRAVITY WAS CALCULATED WRONG DUE TO THE OUT OF TRIM CHARACTERISTICS OF THE ACFT.

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AFTER A LONG AND DIFFICULT DAY OF MECHANICAL PROBS AND CANCELED FLTS; I ERRONEOUSLY ENTERED A CARGO WT OF 100 LBS THAT SHOULD HAVE BEEN 800 LBS. AT THAT WRONG WT; I ADVISED THE FLT ATTENDANT TO MOVE PAX AFT TO OBTAIN A HIGHER INDEX NUMBER TO KEEP THE ACFT WITHIN CTR OF GRAVITY LIMITS. THE FLT ATTENDANT INCREASED THE INDEX BY 7; BUT LATER CHANGED THE NUMBER TO 14. THE LOAD MANIFEST REFLECTED THE INDEX CHANGE. UPON TKOF; IMMEDIATELY AFTER ROTATION; THE FO FLYING NOTED THAT THE TRIM WAS SET IMPROPERLY. NO FURTHER ADVERSE CHARACTERISTICS WERE NOTED AFTER THE TRIM WAS RESET. AFTER LNDG AND DURING POSTFLT; I SAW THE CARGO COMPARTMENT LOADED WITH WELL MORE THAN 100 LBS. I CALLED OPS AT LAX (OUR POINT OF DEP) AND LEARNED OF MY ERROR XFERRING THE CARGO LOAD TO THE MANIFEST. I NORMALLY VERIFY THE LOAD SHEET BY TURNING IT OVER AND LOOKING AT THE BAG COUNT. I RECALCULATED THE MANIFEST WITH THE NEW INFO AND FOUND THAT THE ACFT WAS ACTUALLY 700 LBS HEAVIER (WELL WITHIN LIMITS) AND AFT CTR OF GRAVITY BY 2.3 NUMBERS.