Lee #2 data is just a reprint of data supplied by the powder makers with a few clearly marked instances in which they calculated data for obscure cartridges from very similar, but more cartridges. With the exception of the cast bullet loads in Chapter 10, Lee did not shoot data.
I'd be real interested in just what those "discrepancies" were.
One off the top of my head (I'm not at home right now) is the .45acp loading using 230gr jacketed and 6.0gr Unique.
The published range by Unique powders is different than the published range that Lee put in the book.
I suspect (but don't know) that this is because old man Lee puts data in there to accomodate his dipper system and ignores more accurate equipment such as a good powder measure.
I've seen a few others, too. I'll expound more, later on when the books are in front of me.