I would just go back to the Laser-Cast bullets. I'll betcha that if you mike a bunch of the bullets you're having trouble with, you'll find then smaller, and/or inconsistent.
Of course, you could outside turn the case necks on your brass to get them all consistent, and then get a sizing die with a tighter neck, but that would be a "Royal P.I.T.A."
As cheap as cast bullets are, why put up with the hassle?????
