A good sparking gun will light up the main charge with an empty pan. Tried this a few years back with a couple of guns with 1/16” and 5/64” touch holes. Didn’t take more than a handful of attempts before the ‘ah ha’ moment with each gun. When carrying or storing and not intending to shoot, always suggest a plugged vent hole and a hammer stall. Like wearing a belt even if you are using suspenders. Difference is, you may look silly if your pants drop or you reveal plumbers crack, but with a flintlock you may put a hole in something or someone that really doesn’t need it.