Even though the barrel is a harder metal than the typical ramrod, the repetitive rubbing will eventually damage the crown of the rifling, removing the lands from the end of the barrel adversely affecting your accuracy. But using the Bore Guide from Gunn Innovations will center the ramrod in the barrel to avoid any damage to your rifle. The Bore Guide is made to fit any ramrod 3/8 diameter (0.375) or smaller. It is also made to fit any muzzleloader .45 Caliber - .58 Caliber. Made from Delrin material.