Every flint shooter has ground coarser grade powder down to FFFFg for priming.
Really??? I have been shooting flint for 35 years and have never done that! Three F and even 2F works fine for priming.
What it means is quite simple. Not EVERY flint shooter has ground coarser grade powder down to ffffg.
It is my understanding, based on shooting BP for almost fifty-five years, and ALL the various Pyrodex products since they came out, that Pyrodex of any kind makes a useless pan filler in a flintlock firearm. It's because the ignition temperature is just too high for any kind of reliable ignition.
Do yourself a favour, and don't try and copy the late and much-missed Mr Pawlack in his search for something better, when it already exists in the form of the real stuff.
tac
Every flint shooter has ground coarser grade powder down to FFFFg for priming.