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Lead shot contains the magical ingrediant - arsenic - which helps it to harden when quenched. (Often casters of bullets use a little shot in the mix to enhance the hardness.)

Some casting machines for making lead shot pour the moulten lead almost directly into water for quenching.
 

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Lead shot??

Sorry CW the Arsenic used in lead shot is to reduce the surface tension in the alloy to allow the lead to form into nice round balls when produced. Without the Arsenic the shot wouldn't form nicely and wouldn't fly true.

Antimony is used in lead shot as a hardening agent so the lead shot doesn't deform when the shell is fired and the balls want to all mush together. This Antimony is what creates the hardening effect within the cast bullets.

The larger the shot diameter, the more Arsenic is used in the alloy, as it needs more help to form larger balls than smaller ones. As this Arsenic is the In-Organic version it tends to be nasty, so make extra certain to have good ventilation when melting the shot to make bullets.
 

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AH - I certainly won't argue with one more knowledgable than I. Thanks for the correction. It's a little late in the week to blame it on Monday and bifocals wouldn't apply.
 
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