Hello, it is not normal to fill the implants with a greater volume than their capacity, because they can break more easily, or the solution can begin to leak, this is not normal, it should not be done, but it is something common that some doctors do, I I don't recommend doing that
Saline implants come with a "fill range" that is recommended by the manufacturer. By filling to the upper end of the range some of the characteristics of the implant may be better disguised. However it would not be common to fill a 330cc implant to 500cc as the fill range for a 330cc implant would not go that high. Typically a surgeon would select a larger implant with a fill range closer to the 500cc if that was the desired end volume.