Cut tolerances are generally +/- 5% on all cut lengths. Typical accuracy is much better, and the cuts are usually a little on the long side.  On a typical 25 foot length, we usually are within a few inches.    On longer lengths, spools may have a loose end buried in the spool.  A loose end is where the master spool ran out and a new spool was started.  This does not affect the overall length of wire, but there is a tie point where the new and old wire spools were joined together.