I have noticed that in vanilla game of Empire: Total War that the chance of misfires by both flintlock and matchlock were 0%, where as Percussion Capped (which have less chance of misfire) have 6% chance of misfire.
This mod's aim was to address this issue.
Musket Flintlock weapon's now have a 12% chance of misfire
Musket Matchlock weapon's now have a 16% chance of misfire
Cannon Flintlock weapon's now have a 10% chance of misfire
Cannon Matchlock weapon's now have a 14% chance of misfire
After every misfire (for infantry) it takes them 3 seconds to fix there weapon before they can fire again.
These figures feel right to me at the moment, however it anybody can find me an article on the web with realistic misfire percentages for the 18th I would happily adjust the figures.
http://www.megaupload.com/?d=WSKQCQ5X