I can't see a .001 misalignment in a round. Heck, I can't see a .005 misalignment. That why I use a concentricity gauge to troubleshoot sizing and seating in rifle rounds.Consider that 0.001” miss alignment between shell holder and centerline of die will result in a “big” bulge because the brass is smooth and shiny. It stands out like a turd in the snow.
I don't check pistol rounds with a concentricity gauge, I just eyeball them, it's easy to see a gross misalignment and fix it without one, and that's all that's needed, because a .001, or a .005, misalignment isn't going to hurt a thing.