I use FCD on most ammunition that I load. But I run everything that I use in a match through a chamber checker. Split, bulge, small dents will all pass through the FCD, but not the chamber checker. As mentioned above bullet lube and too much bullet coating will also pass the FCD, but not the chamber checker. Some people don’t check their ammo at all and are willing to take the chance. I prevent everything that I can. I double check screws. Use Locktite on screws, clean firearms and chambers and visually inspect before each stage.
One bad round stuck at a State, Regional, National or the World Championship after spending all that Money and time to get there is worth a few precautions.
BC