How Many CCs are Lost w/ Under Muscle Placement?

It isn't necessarily the fact that under muscle subtracts cc's but when you are tucking samples in a bra they look bigger because they are "stacked" on top of your breasts. An allowance is therefore made by going a bit larger to get the same look. Sounds like you are getting good advice.

The use of implant sizers in the office to estimate final implant size is an inexact science. The determination of implant size is based on your breast anatomy, including breast width, skin compliance, and overall breast coverage for the implant. If you are starting as an A cup, I recommend using high profile implants placed under the muscle. This allows for more volume within the implant and adequate coverage of the implant without distorting the breast. Also, because your breast volume will be essentially all implant, silicone gel may be a better option for you due to its more natural feel and lower tendency to ripple. In breast augmentation, the most common complaint is not going big enough with implants, so if you are uncertain on size, I recommend going with the slightly larger implant.