What size will 300cc silicon unders make me? (photo)

Large B or small C cup. Think about a 350 cc implant is my recommendation over the internet...

Thank you for the question and pictures. Based on your “starting point”, you should have an excellent outcome with breast augmentation surgery. Given the variability seen in cup sizes and different bra manufacturers, there is no way to predict cup size that will result from the use of a specific size/profile of breast implant.Despite good intentions, online consultants will not be able to provide you with meaningful specific advice. Ultimately, in person consultation with well experienced board-certified plastic surgeons will be necessary. Careful measurements, dimensional planning, and careful communication will be key.
Generally speaking, the best online advice I can give to ladies who are considering breast augmentation surgery (regarding breast implant size/profile selection) is:1. Concentrate on choosing your plastic surgeon carefully. Concentrate on appropriate training, certification, and the ability of the plastic surgeon to achieve the results you're looking for. Ask to see lots of examples of his/her work.
2. Have a full discussion and communication regarding your desired goals with your plastic surgeon. This communication will be critical in determining breast implant size/type/profile will most likely help achieve your goals.
In my practice, the use of photographs of “goal” pictures (and breasts that are too big or too small) is very helpful. I have found that the use of words such as “natural” or “C or D cup” etc means different things to different people and therefore prove unhelpful.
Also, as you know, cup size varies depending on him who makes the bra; therefore, discussing desired cup size may also be inaccurate.
The use of computer imaging may also be very helpful during this communication process.

3. Once you feel you have communicated your goals clearly, allow your plastic surgeon to use his/her years of experience/judgment to choose the breast implant size/profile that will best meet your goals. Again, in my practice, this decision is usually made during surgery.
I hope this (and the attached link) help.