Before and after results of breast augmentation with 300cc implants typically show a noticeable improvement in breast volume, shape, and symmetry. Patients with little initial volume achieve a natural enlargement, while those with slightly more breast tissue may achieve a more pronounced result. It is important to note that the final result depends on the initial anatomy, the type of implant (round or anatomical), the surgical technique, and whether the implant is placed under or over the muscle.