Back when this issue came up 10 years ago, I bought a .400 CorBon barrel and dies and challenged all the 10mm guys to show up at the Nationals with their 10mms to show me what they've got. What a waste of money; not a one had enough balls to stand and deliver. I was the only one at the 2001 Nationals with that flavor of gun. The 10mm never was competitive and never will be. They're no worse off in ESP than they were in CDP. It was all about 'mine is bigger (more powerful) than yours.'
Those loudmouths were no better than the Occupiers; just rabble rousers full of hot air.
The Pathetic Ancient Religion at its worst.