David, I'm glad you are okay. I'm not an expert either, but just thinking about what can cause an obstructed barrel. Everyone who reloads has occasionally experienced a squibb load, where the full powder charge doesn't drop when loading the shell. When it's fired, it makes the sound of a pop or pffft. When fired, it only has the power of a few grains of powder, or even the primer only. The squibb has enough power to eject the shot, but the wad is often left behind in the barrel. That could have been shot number 12, but the sound would have been obvious, allerting you to check the barrels.
There is also such a thing as a tumbled wad. This is a rare occurance when the wad is deformed by being loaded improperly. It may have been twisted, or folded over sideways, or a shot cup petal folded under. I have experienced a tumbled wad in shooting, one time. The report sounds like any other normal shell, but the wad melted and tumbled and stuck solid midway in the barrel. Up until that time I had only occasionally checked my barrels during shooting. Luckily, I checked that time, and found the obstruction. It took a cleaning rod, and considerable effort to get it clear. Since then, the regimen is to blow in each barrel, and visually inspect after every shot. This could have been your shot number twelve.
Dave
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