Is 275cc - 300cc enough with 13.5cm BWD? (Photo)

275- 300 range it’s small for you, if you want a full c you need at least 350cc, Your implants should go under the muscle because there is no enough glandular tissue to give cover to the implants

Selecting an implant is best done in person with your surgeon. In addition to selecting volume you will also need to consider profile, type, and shape. Many surgeons have sample implants that you can "try on" to help you get an idea of how you may look after surgery. The sizes you are considering should give you a nice result but it's difficult to say it "won't be more than an a C". I've included a video on implant selection that I hope you find helpful.