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Russel's recommendation is in fact what I've ended up with, with the recent addition of the Shapton GS16K after a combination of a groupbuy and HAD, the coticule gives me very nice shaving edges and...

I believe both Norton and DMT use the same standard for gritsize so those two should be comparable.

Based on the above mentioned gritsizes:

Norton 220
DMT C 325
Norton 1000
Norton 4000...

Here's the DMT grit chart the C is rated as a 325 grit

hope it helps