Joe,
Your concern is well founded. I try to limit sizing jacketed bullets to .005".I don't have any trouble with this limit in sizing 8mm and 32 Win.Spec bullets to .318. I haven't tried the Lee die,but it seems to be well liked by my friends. Being an "old fart" I still use a "ring sizing die" with replacable "rings" that I can make my self. My old friend and mentor Gene Enterkin( I miss him) bumped .308 bullets up to .318,but .010 was a little much and he had problems with some makes of bullets.I gave him some .313, 7.65mm Arg. bullets to try, but he passed away before he needed to try them. I believe my way is the best. BTW the .005" isn't cast in concrete. Maybe it should be less for a smaller bullet and more for a larger bullet.
