The Lee #2 is good in some respects, but some of the data differs with what other makers suggest. I have found several discrepancies in it and I trust any of my other reloading manuals to be more accurate than it.
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.