What exactly is it? I saw some ingots in an oil field supply store today and all they could tell me was it has a low melting point and they use it on the pulleys and cables on pulling units. Can it be used to harden bullet alloy and if so how much in a 10 pound pot of pure lead to make a 15 BHN alloy similar to Lyman #2? Or will it ruin a pot of lead? Any help will be appreciated.