Comments on: Tech Tip: How to Cast your Chamber using Cerrosafe

By: Josh Benin

Josh Benin — Fri, 27 May 2011 15:47:44 +0000

The shrinkage/growth is in inches/inch, not inches.

By: Jeff

Jeff — Fri, 27 May 2011 03:30:18 +0000

Cerrosafe is good but sulphur (sulfur) is cheaper and more readily available from a garden store. I have had great success with sulphur.

By: Keith

Keith — Thu, 26 May 2011 18:45:13 +0000

Sometimes it helps some to also warm the barrel up so the Cerrosafe stays as a liquid until it makes it down the tube to the patch. Nicer casts, less voids, with a pre-heated barrel.

By: Ninth Stage

Ninth Stage — Thu, 26 May 2011 17:38:37 +0000

Just checked on the Brownells site. They say it grows by .0025″ not .0025%.
But that’s not very helpful unless the alloy is so odd that every dimension grows exactly two and a half thousandths no matter what the size or length.

By: Ninth Stage

Ninth Stage — Thu, 26 May 2011 17:33:17 +0000

If it expands only .0025% after 200 hours, that means that for every inch it would grow by 25 millionths. For a big case 4″ long the error would be one “tenth” or .0001″.
It doesn’t seem like there would be any worry over when you measure it as long as you wait at least 1 hour.