Taking Cerrosafe chamber casting of the existing chamber

Now that looks like it could be really usefull/ interesting. Would if make a differrance if using the measurements off of the cast and using fire formed or new brass. Would fire formed cases be more representative of the cast
 
The cast is more accurate. The thing about cerrosafe is that generally, you don't do the whole chamber due to difficulties in removing overflow from the locking lugs. A measurement of the throat is its general use. I use it quite a bit. I'm having a custom bullet mold made for my 9.3x57 and the maker required a cerrosafe casting before starting the work.~Muir
 
Also useful for removing stuck cases where the head has separated. Now who was asking about that the other day?
 
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