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Damon is more knowledgeable about using carbide burs than I. I usually, when carving metal, went about 1200 rpms and I always used a good cutting oil on the surface as I said before. But Damon is the expert on that aspect. So if you're only trying to make a Makers Mark I'd listen to Damon. If you're trying to shape and carve the brass that's a different story, but rule of thumb is the smaller the bur, the faster and vice versa.
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