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This may be of use. George Nonte Jr. in "Cartridge Conversions" lists 25/35 Winchester as being formed from 30/30 brass: "Size full length in 25/35 die; Trim to 2.035"; Neck may require reaming; Use .257" bullets."
Jerry (Mystic Precision, site sponsor; see sponsor's banners at top of page) or Henry Nierychlo (Budget Shooter Supply, also a CGN sponsor) could get you brass.