I don't remember off hand which Nosler manuals we have, but my dad and I each have a copy, his a newer manual than mine. I noticed recently, while I was at his house talking about reloading, that at least some of the so-called "maximum" loads for various cartridges have been seriously downgraded.
For example, my Nosler manual shows 11.5 gr. of 2400 as a max load for the .357 Magnum cartridge, firing a 180 gr. Partition or Silhouette bullet. My dad's (newer) manual now lists only 10.0 (or was it 10.5, I can't remember) gr. of the same powder as the Max load.
I have been loading the full 11.5 gr. for quite some time now and I'm not showing any signs of undue pressure in my gun and I need that extra powder to keep my loads legal for big game hunting so; I don't think I'll be downgrading my loads to match Nosler's new-found timidity.