chopped 1 cup ketchup 1 cup barbecue sauce 1 cup water 2 tablespoons vinegar 2 tablespoons Worcestershire sauce 2 tablespoons brown sugar 1 teaspoon chili powder 1 teaspoon salt 1/2 teaspoon pepper 1/2 teaspoon garlic powder 1 boneless chuck roast (3 to 4 pounds) -- trimmed 14 14-18 hamburger buns -- split In a slow cooker, combine the first 12 ingredients; mix well. Add roast. Cover and cook on high for 6-7 hours or until tender. Remove roast; cool. Shred meat and return to sauce; heat through. Use a slotted spoon to serve