I have a .256 Win Mag single shot on a Martini Cadet frame. Just finished forming 100 brass from .360 Dan Wesson stock this weekend. The .360 DW case is plenty long so the resulting brass doesn't end up with short necks as cases formed from .357 do. Used a .30 Mauser die as an intermediate step. Chopped with a small saw as I do .300 BO. Annealed with a hand drill and a propane torch.
It worked well enough that I sold the NOS brass I had saved up on the S&S. Neck thickness was my primary concern, but the samples I measured were consistent with the factory brass I had.