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The dead horse shall be beaten until morale improves.

Or until someone sits down with a bunch of 8K stones and a good microscope to lay the argument to rest.

Addendum: might also change when...

It's not the old JIS scale. Old JIS scale ended at 3K, 5.7 Microns. If the old one had continued to rate grit finer than 5.7 microns, 3 microns would come in around 5.5K or 6K grit.

I find the Norton stones to be...different in the feedback category. As you say, Naniwa seems to keep a similar feel through the line up. Norton stones start off feeling quite aggressive/gritty at...

Actually Norton rates their water stones on the JIS scale.

For how it actually performs, check out Grazors comment - last post in this thread:
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Skipping stones is just a matter of being willing to spend extra time on the next step up. And I've seen 1 stone instructions for just about every finishing hone known to man. So a lot of these high...

I've seen the 800/5K stone too. Shame that's not a 1k/5k. Then with 2 stones you could have the 1/3/5/8 progression people seem so fond of. I guess in theory the 800 works too, and probably for a...

Must be something they don't have available in the US markets. Just did a quick search and only saw the standard 3/8 option.

The only Naniwa combinations I'm familiar with are the 3/8 specialty stone, and the low grit ceramic ones that we really don't see used often as razor stones. Not that there isn't one, but with all...