We are looking at this same project. No production brass is currently available. It appears that there are two starting points for brass: 32-20, and 30 Carbine. Bottom line: 30 Carbine is a better duplicate of the original case, but the 32-20 is easier to make without costly tooling. RCBS catalogs a "forcing die" set to convert 30 Carbine - it is very expensive, however, no machining is required beyond shortening the case. The 32-20 solution involves laborious machining the rim, but no swaging is involved. Take your pick.
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