hi hun
i had 310 overs last wednesday, i started from a 30B/32A… i bought a bra yesterday from calvin klein that is a 32 DD and fits perfectly!!
i am really pleased with the size, any bigger and i think they wouldve looked unnaturally big because i only have a 26” chest
i’d say go for 300 if youre worried about them looking unnatural or 340 if youre worried about them looking too small!
hope this helps xx