HZ123, luggage is weighted at check in. Then the loadsheet are made using the figures you state per luggage. Keep in mind that there is a max allowed after which you have to pay overweight, and ground takes into consideration that overweight. I remember a ground supervisor for my airline going mad at a check in person for allowing overweight baggage without charging the pax by only reporting it as 23Kgs (max allowed) and pretending that was all (check in person was alone on the flight and didn't want to slow down waiting line. Problem is he did it for more than one pax). Supervisor's point was that this way he could not take into consideration the extra weight for the loadsheet (in this case it turned out to be 600Kgs), and for connecting flights loadsheets.