In the common trap sizes of #8s and #7-1/2s, “magnum” shot usually has 6% antimony, while “chilled” shot has about 2%. Antimony is the basic hardening alloy used in lead shot. It is more expensive than lead, so shotmakers want to economize on it when possible. That’s why “magnum” shot cost more than “chilled”. Silly names, by the way.
The larger the shot, the less antimony is needed to harden it because large shot is harder due to its form factor. That’s why you don’t need much antimony in buckshot and the like.
AlanM wrote:Actually, that makes a LOT of sense.
A very easy way to measure and control the amount of alloying metal in your melt.
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