Update...I put on the percussion cap and fired. The powder did not ignite. Put on another cap and fired, still nothing. I did the trick where you put a grain or so of BP behind the nipple, and it boomed like a mutha!...
while I am not going to make any more of this exact powder,I was able to use the rest of the batch I made by "priming the load" by putting a few grains of BP in the barrel, before I added the white powder.Fired every time!