Hi Contender - I held off posting on this in hopes that someone with a lot more experience than I would answer your question. But they haven't, so here goes.
I used Cerrosafe to get the chamber and throat dimensions of a Rem. 700 I have in .270 Win. To be honest it was a disaster, I'm still trying to get it out of the head area of the chamber. There must be a good method to pouring it in and being able to extract it with the Cerrosafe "slug" intact. But I can guarantee that I didn't use that method if it indeed exists. I followed the instructions explicitly (right temp., wait the prescribed time, etc., etc.) but without any real success.
So I guess my advice would be to have someone who has had success with it to show you how to do it the first time - I wish I had. Or get an experienced gunsmith to pour it and create the slug for you.
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