When the late Jack and Jamie Davies purchased the historic Jacob Schram winery in Calistoga, California, in 1965, they embarked upon what must have seemed at the time to be the impossible dream. Their goal was to produce the finest sparkling wine in America at the 100-year-old winery up on Diamond Mountain. They dreamed of a bubbly that would rival Champagne. Problem No. 1, however, was an inconsistent supply of chardonnay. Yet they forged ahead with dramatic results that inspired a number of prominent Champagne houses (Mumm, Taittinger, Moet & Chandon, and Roederer, to name a few) to purchase vineyard land in California. Son Hugh Davies runs the winery these days and doubles as winemaker. Hugh embraced his parents’ vision and, based upon the bottle of 2011 J. Schram ($120) I just finished, has largely succeeded in the eternal quest to put Schramsberg on equal footing with the best Champagne …