Lead pellets are classified by their alloy content. Antimony is the metal used to harden lead. Antimony is a brittle flaky, crystalline metal with a density of 6.697 grams/cc. Like lead, antimony is toxic. Lead, when alloyed with antimony, becomes a harder pellet. However, when more antimony that is added, the overall density of the pellet is reduced.
"Chilled" shot contains about 98% lead and about 0.5% to around 2% antimony.
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