Cerrosafe Chamber Casting Alloy 1/2 lb

Product #: 462291 Cerrosafe #: 462291
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Cerrosafe is the best known material from which to make a casting of the chamber and throat of a firearm - to determine caliber or check the dimensions. It melts at a temperature just above M&M's, so all you need is a propane torch and a bullet casting ladle. It can also be used to make a cast of a dovetail slot or any other hard to measure area. Also, it is great for removing the front half of a case from the chamber, in the event of case head separation; and lots of folks cast a small portion of the barrel to determine bore diameter. For best results, measure the casting one hour after casting.

Basic Instructions:
  • Plug the bore immediately ahead of the throat of the chamber using a small cleaning patch.
  • Pour the alloy directly into the chamber until full and allow it to cool, it will turn a shiny silver color. As soon as it has cooled enough that it is no longer a liquid (and doesn't present a burn hazard), remove it from the chamber. Take care not to overfill the chamber as the alloy will then run into the locking lug area, making removal extremely difficult.
  • During the first 30 minutes of cooling cerrosafe shrinks. At the end of one hour it should be "exactly" chamber size.

  • Melts between 158 and 190 degrees Fahrenheit
  • Should be melted in a clean iron ladle without direct flame on the product.
  • The chamber being cast should be cleaned thoroughly and a thin coat of oil or graphite applied.
  • Reusable

    Contraction - expansion factor versus time, measured in inches per square inch:
  • 2 minutes -.0004"
  • 6 minutes -.0007"
  • 30 minutes -.0009"
  • 1 hour +-.0000"
  • 2 hours +.0016"
  • 5 hours +.0018"
  • 7 hours +.0019"
  • 10 hours +.0019"
  • 24 hours +.0022"
  • 96 hours +.0025"
  • 200 hours +.0025"
  • 500 hours +.0025"
  • Product Videos

    • Cerrosafe Video
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