Will 275cc Filled to 295cc Saline Implants Take Me Lower Than a B Cup?

In order to make an accurate size recommendation, I would need to assess your chest wall and breast mound measurements and characteristics.  Unfortunately, there is not a general rule of thumb or objective criteria to implant selection.
Your plastic surgeon will perform several measurements of your chest wall and breast anatomy and determine a range of implants that both fit your chest wall and reach your desired goals.
The next step is to try on this range of implants in the office with your doctor.   The key to this success is showing your surgeon the body proportion you desire with a bra sizer and allowing your surgeon to guide you to the right implant.   It will be much easier to communicate in implant cc's than cup size when determining the appropriate implant for you.
I wish you a safe recovery and fantastic result.
Dr. Gill

You have nicely shaped breasts that will add a nice shape to your implants. Your waist is small and your rib cage is full and rounded. Both of these will accent the prominence of your new breasts. The photo is slightly angled but the left breast appears slightly lower than the right, and the left nipple slightly farther from the center on the left breast. It could just be the photo. But if you haven't noticed any difference, it should be less noticeable after the augmentation. The 20cc difference between the two sizes of implants is miniscule compared to the big improvement you're going to get and not worth your concern (It's less than 1oz.). In fact I suggest you try larger implants up to 400cc, put them in different sizes of bras in front of your breast and put some clothes over that to get a good idea what your new figure will look like under normal clothes. When you're sure you've gotten to a size that you know is too large then go back to the largest size you think you'll like. If you're trying to decide between two sizes that are no more than 30cc difference, my experience has taught me that most women are more likely to think they have chosen correctly when they go with the larger size. If you think you've gone too big when you first unwrap them, that's usually good, you have a little swelling and when you get used to them they'll probably seem just right. You'll see a big difference what ever size you choose and I predict you'll soon feel like they're your very own and forget what you started with. If you're concerned with other people noticing, just wear some loose fitting clothes for awhile and you'll probably find many people you see regularly won't really catch on as long as you stay out of a Bikini for awhile. A little anxiety about the right size is natural but usually is an unnecessary worry. I bet you'll look great whatever size you choose.