you may consider making one based off the 7.62x39 Russian....brass is plentiful......Olympic, DPMS, and Model 1 offer bolts....
I made a .338x39 and also a .358x39.....the cases are blown-out kinda like a PPC....both work great for subs and supers....
The C Products 7.62x39 magazines have enough room in them that they allow up to .358 without having to be modified....
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