Stop a few mls short of the spools lip.Most leave around a 2mm for mono but leave braid a tad shorter than that at 5mm or so.The theory is that there is less resistance on the braid from the spools lip if the line is short of the lip,it tends to roll (loop) off the spool better with limited contact on the rim so giving better casting distances as well as less wind loops.
Chers
Reidy