Real purty rifle gun there Ed. What caliber is it?
Suggestions
1. Use real black powder. FFg or FFg as she likes for the main charge. I use FFFFg to prime. Some here say FFFg to prime and only carry one powder. Shoot 'em all changing one thing at a time to see what is happening and keep notes, targets or pics.
2. Get some flints not sawn immitations. I like the results I get with Tom Fuller flints from Track of the Wolf. Several here have recommended another's.
3. Get the gun (unloaded and un primed) up to eye level or your eye down to it and observe the angle of the flint to frizzen with bevel up, down, edge of flint almost touching the frizzen, corner of flint not hitting the barrel, etc. Magic angle of attack is about 60 degrees. Wear safety glasses and cycle the lock several times with flint in it and frizzen closed. OBSERVE!!
4. When frizzen is open and cock all the way forward, flint should be pointing at the center of the pan. Ive seen some flints gas cut by gasses from the touch hole. Dont worry if that happens, the rock is centered as it should be, just maybe a little long.
5. Drill the touch hole out to at least 1/16". I start mine at 5/64" and don't mind replacing it if it gets too big (POI drops and/or you start setting things on fire to your right).
6. Get Dutch Schultz's system (only $15).
Good luck and enjoy the trip.
TC