Don - just recently I asked USPCC about the paper stock because a few of the people I know who have ordered custom decks had told me that Bicycle is insisting that crushed stock is a separate roll of paper and so I reached out to them and this is the email I got
"Yes, it has been a completely different roll of paper since I started here almost 10 years ago "
Tiffany Mahan Custom Sales Manager
Touya - this is my thickness chart, I don't update it much anymore but my thinnest deck is all the way at the bottom
http://magicorthodoxy.weebly.com/magic-reviews/card-thickness-how-will-these-cards-feel
I know this is an older post I'm replying to, but it was worth reviewing.
The thing about stock at USPC is this - all their paper comes from ELSEWHERE. They make that paper into pasteboard stock themselves, but the paper itself isn't made by USPC. And all of their pasteboard stocks are made from the same batches of paper. These days, it's casino grade, standard grade and thin crush stocks - but the paper used to make them is identical from stock to stock. Long gone are the days when the stocks themselves were truly different and sourced differently. Sure, the thin crush is "different" from the standard and casino grade stuff - but only in that the end result is a thinner stock. The paper used to create that roll of paper is no different than what was used to make the others.
USPC stocks are not completely consistent in their thickness. They are offered as being with a specific range of thickness, and there's even some overlap between ranges. A thin casino grade stock can be thinner than a thick standard stock. This probably also holds true for the differences between thin crush and standard as well, but I can't say for sure as my knowledge of their stocks predates the existence of thin crush. I can say with certainty that if you bought several packs of the same deck, especially if it was a mass-produced model and the decks were from different places and made at different times in different batches, you'll see there are differences in the stock thickness. Sometimes, even in the same batch there can be differences - but the differences we're talking about are minute, really more like splitting hairs.
I liken it to when I'm offering my services altering playing cards to magicians. I will sometimes shave a bit of paper off the edge of a card, and I can offer a magician a certain measure of how much paper gets removed, but that measure is always given to them with the caveat that the end result will be +/- 0.05 mm of the exact measure. I'm simply unable to be more accurate than that, and even that degree of accuracy is devilishly hard to create. If I offered that same measure to a magician a month later, making new adjustments to my tools, the resulting work will be very unlikely to be exactly the same measure as the previous work, because it's simply that close to impossible to replicate a given precise measurement with the precision of the tools I'm working with, making adjustments by hand. I daresay that there are even minute differences from card to card with the work being done with the tools at the same adjustments, just because of the nature of work I do - I'm using a single-edge razor blade run along the edge of a jig to make my cuts, with the card held in the jig by my other hand, and there's only so much precision that can afford.