if shooting a lead round ball it will have a lubed cloth patch around it, which engages the rifling not the lead ball. Most likely your accuracy will suffer trying to shoot lead balls from a fast twist barrel. A compromise barrel twist is 1-48" as it will shoot conicals or round balls fairly well. Stick with sabots from the fast twist barrel. Try several brands of bullets with 209 Black Horn powder and you will be very pleased with the results.