On the pistol calibers:
If you shoot a lot in guns that leave a "glock smile". One pass with this die would smooth out the smile. It is suppose to size all the down. In this case, a good pass though die would result in the same result.
Lee now makes a die in 9mm that gets rid of the Glock "smile". EGW initially was modifying Lee dies to do this and now they are stock items.
