I had one of my partners over the other day and he saw my reloading manual sitting on the coffee table and wanted to know why I was using an older edition - the one I use is Speer's #10, 1979.
I don't know what to tell you, Bro. I'm still using the loads I worked up back in '85, I'm still using the same powders, primers and bullets. The loads work perfectly for what I use them for, so why change?
Besides, I only load a few calibers and I know every bit of my reloading data by heart. The only reason the manual was out that day was because I was doing a little light reading the night before.