AFISHN,
I also have a deer stalker, I started with 2f black powder and then moved to 3f black powder, for better ignition , and use 4f in the flash pan. I have a fifty cal. I use fifty grains of 3f in the barrel for 25 and 50 yard target shooting and 70 grains for target shooting beyond 50 yards and for hunting.and only fill the flash pan half full of 4f for fast ignition. my rifle is about 13 or 14 years old and I haven't looked at the new ones, but I had a local gunsmith tune my lock, = reshape and reharden my frissen for good spark, make sure all components work smoothlyand replace my touchhole liner with an uncle mikes brand liner, which really increased the speed of ignition. good luck and hope this helps