Depending on elevation, the type of parent storm, the ambient temperature, and other factors, the water content to snow can vary from 1:6 - very heavy chunky lake effect snow falling right at the freezing point, the kind you get wet just walking from the car to the door, to 1:12 , the kind typically seen in mountainous, more semi-arid locales. The fine white snowboarding/skiing snow. Generally the colder the air, the less moisture in the snow, same with height, unless it's precipitating out due to orographic uplift first.
anecdotally I think I've had to scoop about 30l of snow in a stuff sack, to get about 2-3l of melted water (of which I've probably added at least a cup or 2 of water to get started - to prevent the bottom of the pot being scorched by heat before the snow melts), so that sounds about right.