Combine wine and lemon juice in a large saucepot; stir in powdered pectin. Bring to a boil, stirring frequently. Add sugar, stirring until dissolved. Return to a rolling boil. Boil hard 1 minute, stirring constantly. Remove from heat. Skim foam if necessary. Ladle hot jelly into hot jars, leaving, ¼ inch headspace. Adjust two-piece caps. Process 10 minutes in a boiling-water canner. Makes about 5 half-pints.