Thanks for your question. It's not possible to predict a person's cup size based on implant size alone, for a number of reasons. The cup size achieved with an implant of a certain volume will vary depending on each person's starting breast dimensions and size. Also different bra brands have very different sizing - a person might wear a C-cup from one manufacturer but a D-cup from another. A more reliable way to choose implants is to have a discussion with a plastic surgeon about your size goal, then select implants based on your breast dimensions, the surgeon's recommendations, and other techniques like trying on sizers or 3D imaging.
Without an in person examination I can't tell what 330cc will look like on your body. It is rare to use cup size as goal because there are so many variables. Your measurements and anatomy will help determine a realistic size.
