I have used the Dillon on thousands. Taking your time setting up the dillon, swedge a few, seat primers on the spot with a hand too, adjust as necessary. We have never had a problem with this method.
Problem occurs when you do not try and seat primers during the process.
Also part of the process, grab a hand full at a time, case heads up. Now check for off center flash holes...some lot# have a Lot of off center flash holes also burrs inside the case were the flash hole was punched.
