My mini-RSK came at 20 degrees (as my Lasky showed it), and the edge got a few chips in it when I was trimming my dog's frisbees with it. There may have been some embedded grit in that did the damage. I changed to 25 degrees and haven't had a problem with it since. My RSK1 came at 30 degrees, and I switched to 25 degrees without a problem. 40 degrees sounds way to blunt to me, but maybe spiderco measures it differently. That's more of an axe edge.
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Benton