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Rc 60 is right at 154CM/ATS34's best parameter on hardness. Though it wouldn't be too noticeable if it were 59 to 61 with 60 as the aim point although 59 to 61 is a difference of 10%, 59-60 is 5%.
Note Rockwell C is exponential, but not largely so. 50-51 is 4%, but 60-61 is 5%.
Maybe I ought to do an article on it.
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