@TommyD11730
Not sure where you're getting that info. I've tossed very few over the years utilizing the 'U' die and the overwhelming majority of that was pick-up brass from USPSA matches. Most of the 'rejects' from the case gauge still fit in a gun, but I would never take them to a match. Those were chrono or practice fodder. I have never, ever, never lubed a pistol case prior to using a 'U' die. Cleaned, yes, lubed, no.
I've bought all of my 'U' dies from EGW. "EGW offers custom designed, carbide sizing dies that are 0.003" smaller in diameter than typical dies. Not only is it smaller in diameter, the bottom corner is radiused which sizes the case further down. This helps prevent feed failures from cases that bulged near the base during reloading- which is typical of brass fired in Glocks and other loose chambered guns." At the end of the day, It's a $30 die. Probably slightly cheaper than that roll sizer you mentioned, although I do not know what they cost. (You could probably buy several
years worth of
new brass for what that piece of gear cost, but it
is a nice looking piece of equipment and I like good stuff.)
EGW 9mm 'U' die
Go to Brian Enos' forums if you want to get more info.
Send me a few pieces of your worst offenders and I'll size them in my 'U' die and send them back to you. Mark them if you like so that you'll know I can't do a switcheroo. Maybe they'll gauge, maybe not.