Thanks for your answer. I did take it apart and found the firing pin intact.
However, the hammer does look worn at the point of impact. The firing pin extends 1/8th inch from the bolt face, so that most likely isn't the problem.
When picking up my casings after the the gun misfired, I noticed that one of the primers had blown through. That might have led to the problem. Again, I thank you for your quick response.