If he's using the Lee Deluxe set, then he's got their collet die for neck sizing, which sizes the neck by pressing it inward against a mandrel rather than by sliding it into a constriction, as most dies do. It should be less prone to scratching for that reason, though, personally, I still get all the grit off the outside of the case and the carbon out of the inside of the neck to achieve the most uniform bullet pull. I then also set the shoulder back about a thousandth in a body die, but that's a whole other discussion.
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