Over 20 years ago, I used to, thru our Dept. teach several classes a year to women on self-defense handgun shooting. A hot-shot fireman sent his wife to class with a 6" BORROWED PYTHON, and 50 rounds of what I later learned (almost the hard way) was "hot-shot reloads". My fireman friend proudly watched his wife take her position on the firing line after four hours of impatient class room.
20 rounds into the qualifier I was standing slightly behing and to this wife's right side watching her struggle with the monster Python shooting light loaded 38 specials. On the third round of rapid fire, I heard the tell-tale pop, and quickly grabbed cylinder to freeze the gun. For a moment she struggle against me to pull the trigger, until I yelled directly into her face to release the pistol.
After ordering the irate fireman off my firing line, I cleared the line, and showed everyone the plugged barrel. Whew!