DuncNZ
54 Cal.
I think you are reading the wrong books , I would consider a flintlock which can fire with no prime in the pan every second shot to have a problem with flash hole which is too big and it is dribbling charge powder into the pan and slowly loosing its charge , this may be useful in a Military situation but not target shooting or hunting . A good shower of sparks may possibly set of an unprimed charge but I've never heard of, or seen this happening .All my flintlocks fire upside down .I've read a good flint gun will fire over 50 percent of the time without any priming powder in the pan. I've also read they will reliably fire upside down with a properly primed pan as well. Curiosity dictates that I've got to test these theories one of these days to find out for myself.