cleaning the muzzleloader - yeah, hot water will rather quickly dissolve black powder residue. this is a time honored method of black powder cleaning for many reasons, mostly by happen stance and not choice since water was the most readily available cleaning solution in those by-gone days. however, there are those who say that the use of hot water forces said water molecules into the steel, no matter how well the attempt to wipe or dry out the water, and then a subsequent layer of oil seals in those water molecules and thusly a rusting process has been created. i did the hot water clean then oil method on a pedersoli kentucky and the barrel always exhibited rust a day, week, month later. there is NO question to me that "seasoning" a barrel with a near waterless solution, and continuing its use, is BY FAR the the better "solution" = no rusting, not ever, in the tube of my tip curtis carolina flinter. sometimes the ancient ways can be bettered, here in our modern days.
muzzle loader rate of fire - using my longbow, i can empty my full quiver of arrows quite accurately at 20 to 40 yards shooting distance faster than a brit could fire and reload a brown bess (and not so accurately, too). the firestick of the 14th to 17th centuries was more of a fearful devil's contraption than effective rate of fire weapon. however, it was at long distances that it's usage really shined. this rate of fire got a bit better with the advent of metallic cartridge black powder (the sharps and springfield rifles of general custer, et al). but it was the rapid fire of the lever rifles and revolvers that won the west and put the bow and arrow to rest as a war weapon.