Cask & Coast California Blended Bourbon Whiskey is produced by San Diego-based Cask & Coast Spirits Co. This four-grain bourbon, made from corn, rye, wheat and malt barley, is aged for over four years in new American oak barrels before being finished in French oak casks that previously held California Cabernet Sauvignon and Cabernet Franc wines. It is then bottled at 102 proof.