I prefer these two techniques, after PROV, then to do E:
1) put a barrel light into the chamber, and put a mirror at the muzzle, and look at the mirror.
2) put a barrel light into the muzzle, and put your finger near the chamber, look for light on your finger.
Admittedly there could be a little bit of dirt in there still, but certainly no stuck bullets.
But you can't do those at a CFSC practical test.
During the American Civil War, officers were encouraged to watch their men to ensure they fired their rifles. After a battle it was common to find a couple rifles that had as many as six sets of bullets and powder neatly rammed into a single rifle barrel.