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I work with cartridge brass which is also called yellow brass and has the ASTM specification CD 260. The lead content of CD 260 is <0.06% or less than 6 parts per 100,000 parts. Little if any of this comes out of the brass during tumbling or processing. Sanding or machining it, such as trimming, maybe a little more, but still very little. I wouldn't worry about that amount of lead in the environment from tumbling.
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