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The 9.5x57 was known by both I believe. Or not?

Maybe these old USA catalogues reveal source of errors in naming?

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The 9.5X57 MS has been marketed / referred to by several 'names' over the decades. Case, projectile, and overall dimensions of 9.5X57MS and .375RNE are identical.

Look at loading data from catalogs / references of the 1910s, 20s, 30s, however, and you'll notice that '9.5X57MS' and '.375RNE' have different powder loads and related ballistics.

Note the example previously posted (from an British ICI catalog) shows the MS with 45 grains Cordite, 43 grains for the RNE.

Other references:












Westley Richards, incidentally, also had their own 'express' variant:



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