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.375 Rimless Nitro Express 270 grains bullet + 43 grains powder
maybe a tropical load of the original 9,5x56

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That has been my understanding.

British proof was 43 grains (.375 Nitro Express Rimless), DWM loaded 45 for the 9.5X57.

British proof was, however, for Cordite which was known for sensitivity to temperature.

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Citizen of the Cherokee Nation

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