James Rosier of Victoria, Australia Rook/Kangaroo Rifle circa 1871 - 0.450 Calibre, which case?

Hello members, new to join but lurking for a while. From Victoria, Australia Mostly interested in cast bullets in the 30-30 , then obtained a MH in 577/450 and started playing with that.  Subsequently begain to appreciate the Martini action and picked up...
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