I checked a couple hundred when I bought a case gauge and all passed. Now I don't bother checking. Out of 50,000 9mm rounds loaded (mostly shot through an M&P), I've only had two failures and they were both squibs, so no sizing related problems.
BTW, I use Dillon dies on a 550.
The only failures I've had case gauging .223 ammo have been rims that were too large, so no resizing problems there, either.