Dig around on youtube (maybe someone will post a link) for the slow motion vids of a flintlock ignition.
The object is to drop a spark in, and have the powder flash, with the flash centered over the vent hole, igniting the charge. If you bury the vent with powder, you get a slow, delayed reaction shot. Sorta flash hiss boom, instead of a near instantaneous event.
Take a look on the Track of The Wolf site. For about the same coin, or a little more than the Lyman (which definitely is not the cheapest, nastiest thing out there) you can get a kit of top grade parts, for a kit of a (in my opinion, anyway) nicer looking gun of your choice. Or you can save some money and buy a Lyman kit and finish it up. If that's of any interest.
The Track catalog is a bargain, and they are good about shipping to Canada. Flintlocks (long guns) come in the mail, and you just pay taxes and the postal charge on arrival. Even if building the kits is not something you might be interested in, if you have even a little interest in the BP guns, the Track Cat. is on my "recommend" list.
Cheers
Trev