Many thousands of shots with nary a pick in sight. Unless I get a Flash only. Then its time for the pick, but most likely only to eliminate plugging as the problem. I always prime (I/2 panful), close the frizzen, tip the gun to the off side, and give it a couple of gentle thumps to run the priming into the flash channel, then I tip it to the lock side, and give it a few more brisk thumps to knock the powder back out and over to the extreme end of the pan.(that all takes about 5 seconds) My theory is: running the priming in and out of the channel deposits a dusting of superfine powder on the way, which is left behind when the majority of the prime gets knocked back into the pan. That fine dusting gets lit up by the ball of fire from the pan, and (my guess) accelerates the flash as it does so. There is certainly no 'fuse effect'; usually just like shooting percussion, but more drama.