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1. Place 1 cup of berries in an 8-quart heavy pot. Crush berries. Continue adding berries and crushing until you have 5 cups crushed berries. Stir in pectin and butter. Heat on high, stirring constantly, until mixture comes to a full rolling boil. Add sugar all at once. Return to boiling; boil 1 minute, stirring constantly. Remove from heat; skim off foam with a metal spoon.
2. Ladle at once into hot, sterilized half-pint canning jars, leaving a 1/4-inch headspace. Wipe jar rims; adjust lids. Process in a boiling-water canner for 5 minutes (start timing when water returns to boil). Remove jars; cool on racks.