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I had been adding a one pound roll of 50/50 solder to 10 or 20 lbs of WW's to harden them but have been advised that its probably too much tin and likely wont help. When you cast if you drop the bullets out of the mould, drop them into a five gal bucket filled with water (with a few car sponges in it to break their fall) and this will go further to hardening them than anyhthing else. I haven't tried that yet but plan to on a day when the skies will hold.
When you skim the dirt/impurities off the pot...flux it first because the tin will seperate and rise to the top to look like dirt and you want it to stay in there. Fluxing it first will blend it and leave just the dirt to be skimmed.
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