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There may be no need for the 3" dies. Try sizing the 3" cases after firing them and see how they chamber.
Your pressures probably wont be high enough to expand the base to any degree that would need full length sizing unless the new brass won't chamber all the way and you need to size them prior to the first loading.

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That is certainly what I would have done, if the new 3" actually chamber OK and don't need the bases sized down first.

Some straight cases FL sizer dies are open at the top, allowing longer cases to be sized perfectly, or almost - much depends on the die design themselves.

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Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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