As @pink butterfly says it's really hard to say. Everyone has a different body shape. However, judging by what others have shared a 275cc will give you a C from an A cup. With the 295cc there will not be much of a difference, perhaps a little fuller but still a C cup. It's only 20ccs difference, when you measure that it's not much.
I had 375cc and I was originally aiming for a full C cup (from a non-existent AA) - I ended up with DD, but I am totally happy with my boobs, they suit my body perfectly and look completely natural to me
Good luck with your final decision and keep us posted!