As I mentioned last week, Bellwether Wine Cellars is open for business, having opened its doors with a pinot noir and three rieslings available for tasting and purchase. The first thing you’ll notice about Bellwether Wine Cellars 2012 A&D Vineyard Wild Ferment Riesling ($27) is that it’s bottled under a crown cap — not something you see very often. It’s not just because Bellwether Hard Ciders has that equipment around, though. Along with being fermented with ambient yeasts (a topic of some debate of late), this wine was bottled with far less SO2 (only 50 ppm) than is typical in the Finger…