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10 Spot Terminator's been there !
Most clip-on wheel weights will come in 12-13 on the BNH scale, if you water quench your cast boolits and let them set up for a while they'll harden up around 18 BNH.
According to Lyman's Cast Bullet Handbook, it's the trace prescence of arsenic that reacts with the casting process that makes the wheel weights harden without greater amounts of antimony.
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