I bought a Traditions Mountain flintlock and while ago and I’ve always had one hell of a time to get it to actually fire.

Started using black powder substitute that the gun seller swore by (a muzzle loader specialty place).

No luck with the fake stuff so I finally got some fffg Swiss and it’s better but still hit or miss.
Tried more, less, and everything in between for powder in the pan. Also priming with fffg.

Any tips to make it go boom? Pan ignites, but that’s all I get 80% of the time.
Swiss powder is about 1.5 years old, but it’s been opened twice and stored in a climate controlled area. I can’t imagine it is bad since the pan is still going off reliably.