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Greetings
Tin was also added to lead to harden it. But to stick with the thread I have never come across any Cival War projectile that was not near pure lead.
With the minis this was due to the need to expand and grip the rifling upon firing. Hardened ammo (20-1 lead to tin) would not due so properly.
With the revolvers a hardened ball will cause excess strain on the rammer teeth and the rammer will strip or break.
Mike in Peru
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