My m/l mentor was once asked to put on a demonstration of how long it takes to load and fire a m/l rifle, at a state fair. He chose a flintlock because he knew that self priming would speed things up considerably. He used finer grained BP to do the demonstration and loaded and fired a flintlock rifle something like 9 times in 60 seconds. He said he would lean the rifle to the right as he loaded to facilitate a priming charge exiting the vent hole into the pan, and it worked perfectly every time.

May God bless America and those who defend her.