Oven Heat Treating Cast bullets, Water Cooled to Harden. Alloy must contain 2% antimony, minimum.

Oven Heat Treating Cast bullets, Water Cooled to Harden. Alloy must contain 2% antimony, minimum.
243winxb, Mar 25, 2021
    • 243winxb
      The RCBS 2 lube needs to be washed off after sizing, before bullets go in the oven. Warm water & 2 drops Dawn work well.

      Q: Is there anything I can do to make the bullets harder?

      Cast bullets can be heat treated to increase their hardness providing your alloy has 2% or more antimony present. To heat treat your bullets: Cast your bullets in the normal manner, saving several scrap bullets. Size using RCBS 2 Lube. WASH OFF. Place several scrap bullets on a pan in your oven at 450 degrees and increase the temperature until the bullets start to melt or slump. Be sure to use an accurate oven thermometer and a pan that will not be used again for food. Once the bullets start to melt or slump, back off the temperature about 10 degrees and slide in your first batch of good bullets. Leave these in the oven for 1 hour. Remove the bullets from the oven and plunge them into cool water. Allow them to cool thoroughly. When you are ready to lubricate, install a Lyman sizing die .001" larger than the one used to initially size them, OR Tumble lube with Alox. This will prevent the sides of the bullets from work-softening from contact with the sizing die. Next apply gas checks if required and lubricate. BULLETS WILL TAKE 2 WEEKS TO FULLY HARDEN. These are now ready for loading.
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    9mm Luger-Taurus G3C-Lee 356-120-TC
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