I just picked up this revised edition of the Lee book. The front half is pretty much the same, but the data is much expanded and all pressures appear to be listed in PSI and not CUP. The cartridge data base is also expanded and the format enhanced.
This book has some invaluable tools for the reloaders. With most powders there are methods for calculating reduced loads, targeting velocity with them, and calculating pressure changes with any given load. It is also easy to calculate relative load density using this book. It's No1 in my reloading arsenal of abut 100 reloading manuals.~Muir