Reamer Rentals
Cerrosafe®
Chamber Casting Material
To
make a cast, clean the chamber thoroughly and apply a very thin film of oil or
graphite. Plug the bore immediately ahead of the throat with a small cleaning
patch - but not so tightly it cannot be driven out. If possible, pour the molten
alloy 
through
a small tube into the bottom of the cast, gradually removing the tube as the
chamber fills. We recommend that you warm the barrel to just above room
temperature before making the cast. When cooled, remove from chamber, using a
rod or dowel from the muzzle end of the gun.
Cerrosafe
shrinks during the first 30 minutes of cooling and then at the end of an hour,
is EXACTLY chamber size. At the end of 200 hours it will have expanded
approximately .0025". This factor is known to reamer or die makers and they
will take it into consideration when making dies, reamers, or gauges from your
casting - just tell them the cast is of Cerrosafe.
Cerrosafe
is reusable, and never wears out. It provides excellent casts of chambers
and will save you from costly guess work. Identification of chambers is
simplified by a clean chamber cast that you can measure and rely on.
Cerrosafe
melts between 158° - 190° F. This alloy should be melted in a clean, iron
ladle. Source of heat should be removed as soon as the alloy is completely
melted, at which time it is ready to pour. Solidified castings should be removed
from the chamber before, or when, it cools to room temperature. Cerrosafe should
not remain in the mold more than an hour, as it will grip the chamber walls and
be difficult to remove.
Just
a few minutes work, for reliable results.