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Originally Posted by hammie
@Mr. Pfleuger: I'm ashamed to say that the lee collet dies are new to me. From what I could learn at the lee website, it seems that the collet dies are a different way to neck size only.
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You can do either.
The collet die sizes the neck in a unique way, by pressing it against a mandrel. That means it's sized "from the inside", so variations in the thickness of the neck are irrelevant. The slight tolerances of a shellholder and the centering effect of the mandrel means that the case self-centers too, which makes for extremely concentric sizing. The collet die requires no lube of any kind, anywhere on the case. The mandrel is one size along it's length and there is no expander plug to pull the neck out of line. The case is pressed against the mandrel and then released. It springs back 1 or 2 thousandths and slides cleanly out of the die.
The Redding body die bumps the shoulder back .001-.002 and sizes the body but leaves the neck completely untouched.