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Old November 15, 2008, 01:06 AM   #7
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Join Date: January 9, 2005
Location: Moses Lake WA
Posts: 1,001

This is a material that melts at stovetop temperatures- 150-200F (or thereabouts.) Basically, you plug the bore at the end of the chamber VERY tightly with a patch, and C A R E F U L Y pour the melted stuf into the chamber. When it has cooled, you take it out and can measure your chamber dimensions. At this point, a visual comparasion of the loaded 25-20WCF round and the chamber cast will probably tell you what you want to know.

There are full instructions somewhere on exactly how to do the chamber cast, but that is a rough outline. I haven't cast a chamber for about 50 years, so my memory is a little rusty. The page listed above had basic instructions, also. Somebody here can give you better instructions, or you might try asking over at :

They love these kinds of questions.

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