Finally got to shoot today. Ran some 28 Eurotrash hulls with Winchester primers after using the UPP from Creative Reloading Solutions. These are Nobel hulls, and the 209's could easily be pushed in by hand. After sizing, the primer could not be pushed in by hand, period. As you can see, there is no carbon ring on these hulls, nor is there one on the breechface of the K-80.
This tool does exactly what the inventor claims.