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happycowboy,
The 49th Edition of the "Lyman Reloading Handbook" on page 81 discusses Lead Alloys. It says, "Pure lead has a Brinell hardness of 5. An ideal alloy contains 5% antimony, 5% tin and 90% lead. This alloy has a Brinell Hardness Number of 15."
Hope this helps.
Adam
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Adam Helmer
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