Hello
I've been shooting with a 4x5 camera for years and have always managed to avoid shooting in the snow. Until now. I've been in Utah the past couple of days in Utah and there's snow everywhere. I'm worried about the snow being too blown out and don't know what to expose for (as a result I've been shooting several exposures of the same scene - figuring i can at least learn something by comparison) I've basically been working with the ambient reading, and have noticed that most of the time a reflective reading off the snow is within 3 stops. I'm shooting Portra 160.

Should i be over exposing and pull processing?

Help!