RE: Black powder substute
Duplexing a load has been going on a long time. When I was testing the different substitute powders that "claimed" they worked in flintlocks.. I discovered basically the same thing as you. Sure they will fire. Just not consistently.
Pinnacle was a really strange substitute powder. If that flint was extra sharp, the touch hole very clean, a little banked in there,and the sparks exta long, I could get it to ignite pretty good. I started duplexing it with two dumps of 4f from my pan primer (6 grains) and it fired like black powder.
I had the same results as you with Triple Seven. I have no idea how people get pyrodex RS to ignite with a flintlock. My rifles hated that.
But I am fortunate in, since I shoot black powder 90% of the time out of my rifles, I keep a large supply on hand and always have some for my flintlocks as well...
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