Interesting video Parabola. I am familiar with the matchlock system, but never actually saw one being fired. It was cool to see all of the steps involved before actually touching it off. I never thought to search YouTube to find a video. Thanks.
The shooter mentioned excessive muzzle flash. That was probably the result of his formula for choosing a powder charge. A powder charge weight equal to the round ball weight would be quite a bit more than needed, and result in excess powder still burning as it left the muzzle. His ball ramming technique made me cringe a bit too.
