Getting 9mm brass sized back to factory spec is, in my view, almost impossible. I've reloaded and successfully fired thousands of rounds, however. To my knowledge, none has ever failed.
I check each round by dropping it into a Lyman case gauge. If it falls out, I consider it "good." If it sticks or stands proud, it's usually either 1) dirt in the gauge or on the round (brushing out the gauge usually fixes it); 2) damaged cartridge rim or 3) split case.
That said, it still bothers me that when I employ a really accurate case checker gauge, like the Shooters Box, most of my reloads don't "plunk" into the gauge's "chamber" while factory 9mm fits perfectly.
In the above picture, you can see the Lyman lets the round in just fine, while the Shooters Box says "no go."
Not exactly sure why I can't get the brass back to factory spec. I'm using Dillon dies. Perhaps it's that the slight taper the 9mm Luger calls for is not exactly the factory taper. Who knows?
Does a roll sizer restore the factory spec taper to 9mm? Anybody out there even have a roll sizer?
All I know is that if my reloads fit the Lyman block, they'll cycle in all my 9mm's reliably.
If the reloads don't fit the Lyman block, I pull the bullet, powder and primer, and toss the brass.