Yesterday was a bit frustrating at the firing line. With aggravating frequency my pan would flash but no ignition of the powder charge. On a couple of occasions I resorted to pushing powder into the liner hole with my pick to make the charge ignite. The last time I went shooting was about 4 weeks ago and nothing has changed since then. At that time the flash and firing was almost simultaneous, as always with this rifle. This time, same powder, same loading procedure and frequent misfires and slightest of delays before firing. Blue skies, sunshine, low (for here) humidity. I'm at a loss as to why I had such problems. Suggestions?