Simply take an old spoon [cheap soft metal table spoon works for me] and bend the sides up so it will fit into the '73 action and pour into the chamber. Hold the '73 vertical in a padded vise with the cleaning rod/patch already in the bore with the patch just ahead of the chamber. Put the Cerrosafe in the spoon and melt with a propane torch then pour into the chamber. Let it just solidify and cool for maybe 5 minutes then knock out the Cerrosafe/casing with the rod.