I would not use the Rocky Mountain Brass. It is turned (not extruded) and would use a 12 gauge wad instead of an 11 gauge wad. Many of the older guns had larger bores, not the now standard .729. I have one that has .751 bores. The 2 1/2" extruded brass by Magtech (CBC) will hold, as I remember a stiff load of BP and shot. You just need to cut back on the wadding. Ask Craig Smith owner of Circle Fly Wads. He often uses less wads and he has done extensive BP shooting both muzzel and breech loader.
Harry
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