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Clark thinks there ought to be a term for that space between the shellholder and die. 'Twas told decades ago that space was called the "die offset" and was only accurately measured when a full length sizing die had a case in it with the press's ram all the way up putting maximum spring on the press. I don't use that term, but it's sounded good to me over the years.
Unless the shell holder actually stops against the die's bottom when full length sizing a rimless bottleneck case, the resultant case headspace will vary a few thousandths due to how much the press springs for the lubricant between the die and case.
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