Fyi, The CSN & CS Marines used a lot of "converted to percussion" surplus Bess (and other) muskets for guarding prisoners, guarding government facilities, repelling boarding parties & LIKED them at "shipboard ranges", as the Bess was available, CHEAP & DEADLY.
According to the staff of The Imperial War Museum, the Bess was routinely loaded with "fluff", which was a mixture of shot, nails or bits of scrap metal & broken glass.
(I sure that enemies would have FEARED being fired upon with that load. = It must have made a "bloody mess" out of anything that it hit.)
yours, satx