They seem to be the same thing. :)
Pouring over all the load-data have on hand here that's the conclusion I came to. What do you think?
Same loads by weight and... the volume to weight ratio seems to be the same too.
So then along comes the many "powder speed" lists and 800-X is way down there below Blue-Dot540/HS-6 etc. :/
Alvin in AZ