That's wild. I can see getting so nervous or shaken that you mess the powder charge up - I can see that easily. Spill more than you charge.There's a reduced charge, right there, waiting to be fired, and not get a projo out of that long barrel. Or, next to last step before you fire, you don't notice that you missed the cap, dropped the cap, or didn't seat the cap - and it falls out. Last step, you don't take it from half-cocked to full-cock and try to fire it - reduced hammer speed...
Alot can contribute to that, but I never, ever knew there were that many problems. That's pretty eye-opening... 😮