I cannot insert ANY braking action in my landing distance calculations. I could on the 737, I can't on the Airbus. So if BA is reported medium, I have no way of knowing exactly what my landing distance will be. I can insert the contamination (compacted snow, wet snow, icy) but that's about it.
So what do I do when there is fresh snow on the rwy, BA medium?
Depends on the day and what I see and hear, which is no professional way to do aviation, but what else can I do?