I've been making Cranberry wine since 1976, usually with fresh cranberries. I've occasionally added some Cranberry juice cocktail and every so often I've made it with canned cranberries. I'm not sure, but I don't believe that a pure Cranberry juice exists. It seems like you would need 50 pounds of berries for a gallon of juice.... I use between 3 to 5 pounds of berries / gallon, start with a sg of about 1.1, and always back sweeten. I've tasted some locally made dry Cranberry wine and it is atrocious. IMHO there are VERY few good dry fruit wines. If you've never made cranberry wine, start out with a Jack Keller recipe. After you've made it and critiqued it, try changing it. Use more fruit and add some cranberry cocktail, and try pure juice; but don't try straight juice on your first batch.