with my lee dies, the problem was the resizer. The case neck was out true after resizing. Once the neck was off, I don't think the rest mattered much.
after that experience it became one of mys steps when setting up a new set of dies. Get shoulder set back to speck -or neck size, whichever the die is for- and then check the runout. I've never had to replace another die, any brand. Odds are if I'd had Lee replace it, I prolly would have been fine, but I just said screw it, tossed the set & bought a Redding set, since I already had some of those and liked them.
