This has always been my progression – 1000# the 400 Choseras.
“I don’t always use Chosera’s, but when I do I always start with 400’s” Stay thirsty my friends. B)
I don’t have the grit specs here by memory.
What I have learned from experience is that the 400 Chosera’s are black (more than the other Choseras) after use. Visually the edge is definitely much more polished to the naked eye. I have a 10x lupe, but no scopes. I can’t say if the edge is more or less refined.
While I have never “mixed” stones in progression, I can say based on feel (stone feedback) and appearance that I would not want to go diamonds, chosera, back to diamonds, then more choseras.
All that being said I think Mike said it better.