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Zinc is the closest to lead but the temps you would have to work at would be trouble for moulds other than steel, then the fumes .
The exp I have with zinc ,it would be close to 1kf to get it to work ,then the mold 500+ & even then fill out would be ???
But the bullet would be so hard if even a spec of the band is full dia. it should hold pressure back .
The use would be target only as they would shatter upon imact !
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GP100man 
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