sharp...I have shot flintlocks since 1977....I don't even own a percussion...remember flintlocks were in common use for over 200 years, longer than any other ignition system...First, you can load and prime with FFF...I have used FFFF to prime, but it is not necessary...Second, stick with a great lock....I prefer a Siler (Chambers) etc...Third, use English black flints...knapping is easy, take a finishing nail, grind off the point and use a little brass hammer to flake off the leading edge, while moving the nail along the edge, or you can just put the cock at half cock and lightly tap the leading edge with the hammer, while holding your finger under the flint....

I never had problems with making a flinter work, when I got started I didn't know anybody that owned a flinter, first trip to range and I was shooting 1 1/2 inch groups at 50 yards...If your prime is dry, flint sharp, touch hole coned and open, main charge dry the gun will fire, its just that simple....

You do need to realize that a flint lock will fire without prime....Don't check the sparking of the lock with a charge down the barrel....