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what I want is a 243WIN cartridge, only with a flanged case, with no other changes! The 307 Win is a 308 Win case with a SIMI RIMMED case that can be run inot a 243 Win die to turn it into a simi rimmed 243 Win, after reaming out the neck. I may build one of those, but I'd rather have a real flanged case.

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Mac,
Why not use the 9.3x74R case to create your .243 flanged?
The head diameter is only a few thou smaller than the .243 Win case and the 9.3 has a proper rim. You could shorten it to whatever you want and straighten out the taper a bit as well.
You could also consider the 7x57 Rimmed or the 7x65 rimmed as parent cases.

You are right in that the .243 caliber is probabaly one of the "gaps" in the line up.
I reckon one of the hardest things in putting a home built SxS double together for such a cartridge would be finding a small enough action frame.
Might have to build one from scratch!

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