My first suggestion. Assuming the gunmaker could do it.
.360 No.2 Nitro Express
Quote:
The .360 No 2 Nitro Express is a rimmed, bottlenecked cartridge designed for use in single shot and double rifles.[1]
The .360 No 2 Nitro Express fires a .367 in (9.3 mm) calibre, 320 gr (21 g) bullet at a velocity of 2,150 ft/s (660 m/s).
https://en.m.wikipedia.org/wiki/.360_No_2_Nitro_Express
The 9.3x74R is of course more practical. Much the same ballistics? Maybe this .360 is slightly more powerful.
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