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It's true to an extent. You could give me a blank made of best steel ever but you wouldn't want to shave with it after I put it through the grinder. However a good metalworker will also tend to use...

I was thinking of the ballpark of 60 as someone mentioned it here earlier. I'm glad my assumption was correct. A better question would be "how hard would be too hard to hone with our gear, within a...