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Huvius,
If a 35cal expander was run through 300H&H brass ... will that essentially get you a 350 G&H Magnum case? If so ... chambering becomes a 300H&H reamer followed by 35cal neck/throaters ... dies are easy to arrange by opening a 300H&H set ... hmmmmmm!!
Cheers...
Con

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Seems that Western probably did make the 350G&H from 300H&H. I measured the rim thickness of fired cases and the 300H&H measured between .015" and .016" The 350G&H measured between .012" and .013".
I suspect the brass thins out as it is resized (stretched).
Sounds reasonable that you could resize to .35 cal. and fireform the brass to your chamber.
You will notice that the shoulder on the .350 is even a little further up than the .375, so you could probably neck down and trim .375 brass as well and then blow out the shoulder in the same way.

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