White Fox is right on the money about keeping your flint clean. I do Rev War reenactments where we will fire 30 to 40 blanks during an engagement on a good day. Firing blanks fouls your gun much more that live firing with patch and ball. After about 20 shots you will have significant fowling.
One of the things that was pointed out to me early on was that the flint will build up fouling underneath the edge of the flint, essentially dulling the flint if you don't clean it off. In fact that is the most common cause for misfires for me - not a flash in the pan but that terrible "clack" sound. It's really easy to fix though. I keep a strip of patching material hooked onto my brush and pick hanging on the strap of my shooting bag. I just put the end of it in my mouth and soak a bit of saliva into it and then rub the bottom and top of the flint with it to clean off the fouling.
Be really careful when you do this. I try to rub from the body of the flint to the edge. If you rub along the edge, you will quickly find out why flint tools were so effective butchering meat. If you flint is in good shape and just dirty, that edge will be extremely sharp - consider it a knife edge. You've been warned!
There's an old saying about flintlock shooters, "There are only two types of flintlock shooters - those who have cut their thumbs on their flints, and those who are going to cut their thumbs on their flints." Same thing can be said about dry-balling of course... :shocked2: :shocked2: :shocked2:
Twisted_1in66 :hatsoff: