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I have email with CH4 die factory. They do not have the .450/400 2 7/8 dies in stock or on the program.
2 years waiting and approx $500 for the die set. I have to supply a case or drawing in order for them to make it.

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I wonder if the .450/.400 3 1/4 is dimensionally alike except for the longer neck? That way the basic cases could be sized at least, and fireformed cases obtained.
- Mike

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I was thinking the same thing and using 10mm auto as neck sizing die afterwards.

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