Re: Velocity differences with H-1000
Yor not crazy. I've got both types of powder in my reloading room. Yes the H1000 non-extreme is different enough to warrant the std safety disclaimer to backoff and work up/down accordingly if your data was developed with the newer extreme rated powder. Have seen it before in my 338.
Also the real old original lots of H1000 were even slower yet, based on my experience.
I like the new extreme stuff in my 338 Yogi, but just don't mix the different "types" together.