I'd say the two I shoot regularly, a 50 with a siler (Goex 3f) and a 36 cal (the same, 3f) with a Chambers late ketland fire that fast. It surprises those who have the impression that a flintlock is inherently slow to fire. Click/KA-BOOM! is the way she goes, an almost imperceptible 'delay.' I often use Goex 4f for primer.
dave