@OmSigDAVID,
Black Powder misfires are the consequence of poor maintenance.
The sulfer in black powder is very corrosive, consequently misfires are common if you don't clean the foring pan, touch hole, and barrel frequently and thouroughly.
I've seen blanket and turkey shoots with black powder, where the highly experienced marksman swabs the rifle after each shot and pricks the cap or touchhole after every third shot where misfires are rare--about as common as a jam with a modern rifle. The key is cleaning.
To make sure my blackpowder firearm is fuctional I follow the listed directives along with a thourough dissassembly and cleaning after and before each use, along with storage in a clean dry location.
Consequently, misfires are rare when in the clutch of harvesting a whitetail or participating in competition.
Same goes with friends with muzzle loading shotguns.
BTW I have a friend who does trap and skeet with a black powder double barrel.
Black Powder pistols require regular use and cleaning to maintain function in a clutch, but in the day when their use was necessary usually practice and maintenance was routine.
To make the point, Frank James --Jesse's older brother, carried a black powder Remington throughout his career as an owlhoot. A Career that spanned the introduction of the Colt 45 and smokeless powder. When asked why--he supposidly stated that the smell and smoke left an air of customer compliance.
Rap