Um, I wouldn't want to hear than until I hear Curtis M. Ford's ideas for brass. I wonder how the pressures compare? Right off the cuff, I'd take some 9.3X82R, cut them back and fire form them. It was a proprietary round, probably a rare chambering, and would date from say 1905 till 1912. I believe it was based on the BPE 0.360" and was an attempt at an Express variant.

Kind Regards,

Raimey
rse