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The case dimensions are the same, except for the rim, so all you need is a suitable shellholder and you're in business.
I worked with a semi-wildcat based on that same system once. It was a .300 Savage Rimmed,and used .300 Savage size dies with .307 Win shellholder and 307 brass. One pass and the case was reformed into 300 Savage shape, but with a rim for single-shot rifle use. Slick.
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