Found some old load data, I copied pages out of old manuals friends had. I though I read maybe here or heard on a podcast that older loads "expire" or get update so to say?
I wouldn’t say they expire but they do get updated from time to time. New data is pretty easily found these days. The front half of the book is the biggest need to keep one on hand.
You can check for errata sometimes. The newer data will be more relevant and will be created using more precise technology. Bullets change a bit and powders can change sometimes.