@alanwk: I apologize for my reply. I dashed it off in haste and it was rude and snarky. At one time I had an older copy of a Lee Reloading manual, and it was just reloading data copied and regurgitated from other sources. I did not consider that Lee manual to be definitive or comprehensive. Maybe that has changed with the newer ones.
I believe the major bullet makers do their own testing and load development and the book shelf in my reloading room contains the latest editions of the Lyman, Sierra, Speer, Nosler, and Hornady manuals. If you reload for many cartridges or for not so common cartridges, Ken Waters' "Pet Loads" is nice to have. I indicated in my first post the manuals which have dual data to the .223 Remington and the 5.56 NATO. I hope you found the answers you needed.
Again, please forgive me. I'll try to frame my answers better in the future.
I believe the major bullet makers do their own testing and load development and the book shelf in my reloading room contains the latest editions of the Lyman, Sierra, Speer, Nosler, and Hornady manuals. If you reload for many cartridges or for not so common cartridges, Ken Waters' "Pet Loads" is nice to have. I indicated in my first post the manuals which have dual data to the .223 Remington and the 5.56 NATO. I hope you found the answers you needed.
Again, please forgive me. I'll try to frame my answers better in the future.