Do reams of standard office paper vary in size - how percisely cut are reams of paper

[steve]

Do standard reams of 11 x 17 office paper vary in size? How precisely cut is standard office paper? Is it typically consistent from ream to ream? Does it vary with the paper's age (and possibly humidity content, etc?

I have a few cartons of universal office paper here and I'm noticing that some reams are exactly 11" and others are 1/64" to 1/32" wider, but I'm not sure if the reams are from the same date or if some might have been stored in a warehouse for a year for example, or maybe produced at a different facility with different equipment.

Do you all find that most common 11 x 17 office paper is exactly 11" x 17" or is it typically off a bit due to shrinkage or expansion before you get it? Is it consistent ream to ream within a carton, or no?

When running very common economic office paper like this, do you typically cut every ream on your cutter before printing to get perfect registration?