Mine was the time I forgot to crimp in the final stag to take the bell out of the case. When I showed up at the indoor range I had 200 rounds of 9mm that would not chamber. I packed up with my unused targets and sneeked (Spelling on purpose) out. When I got home I ran them through the taper crimp and was good to go. I waited for another day to return to the range incase some of the ones watching me the first time were still there. Boy was my face red...
