Mr. Murray brings up a book that is worth your reading. The full title is "Muzzle Loading Shooting and Winning with the Champions" by Max Vickery, Webb Terry, Bob Butcher, Don Davis, Walter Grote, Bill Carmichael, Peter Allen, and Warrren L. Boughton (edited by Don Davis). I corresponded with Bob Butcher for a while and found he readily shared his experience on how to wring maximum accuracy from a rifled musket. A really nice fellow! I think that his remarks regarding the rifled musket actually apply to the firearms of seriously competitive muzzle loading shooters, "The rifle must look, feel and function as a military rifle, but perform on targets like a match grade rifle, which it really becomes." Topnotch triggers, locks, etc. and LOTS of discipline and serious, thoughtful practice. At my age, I will have to leave all of that to the younger folks with better vision and physical condition.
Above all else, be safe and have fun!
J.B.