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Excellent post and some evidence.

Bloody Americans getting it wrong! Ha ha. Joke.

But this Stoegers Catalogue of 1939 shows some evidence of where the nomenclature came from.

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Perhaps we 'bloody Americans' got it wrong twice?









The '.275 Rigby'/ 7mm Mauser 'High Velocity' designation reminds me of this:







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Citizen of the Cherokee Nation

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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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Citizen of the Cherokee Nation

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maybe kynoch download the .275 rigby for the use in hot climate

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Image below showing labelling of the lid end of the same old Rigby ammo box with ammunition referred to as .275 Mauser not .275 Rigby. Pity cartridge head-stamps can't be seen to confirm exactly what nomenclature was applied to the ammunition. I'm betting most likely 7x57 or in keeping with the age, 7mm Mauser.

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Or this, for the 'Rigby No. 2' double rifle:







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Citizen of the Cherokee Nation

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So please explain what the difference is between the 275 Rigby and the 7x57 Mauser?

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So please explain what the difference is between the 275 Rigby and the 7x57 Mauser?

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Case wise, dimensionally, there is no difference.
Brass, dies, etc. - all the same.
The “Rigby” moniker is derived from their specific loading of the same cartridge.
The 275 Rigby was loaded with a lighter bullet and higher velocity than the standard 7X57 Mauser.
What was it, 140gr. Bullet for the Rigby and 170 something for the standard Mauser cartridge?

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According to some sources, anti-German sentiment also came into play when Rigby came up with their high velocity 140gr loading for the 7x57 or 7mm Mauser cartridge, their thinking was the name Rigby would be more palatable to the British stiff upper lip. Whether this was a factor or not who knows.

Apart from recent American loadings with a .275 Rigby headstamp on the cartridges to suit the vanity of some, original cartridges headstamped .275 Rigby seem to be non-existent or a rarity at least. Searches come up with plenty of old cartridge boxes labelled ".275 cartridges for the Rigby Rifle", or similar notation, but no images of the cartridges to prove there was actual ammunition produced with the definitive .275 Rigby headstamp.

In regards the heavier bullet loading for the 7x57/7mm Mauser/.275 cartridges, there is some confusion in this area too. Bell and Corbett were great exponents of the .275 cartridge in what ever moniker it may have been and in both their cases it is often said they used the 175gr bullet. Kynoch however used 173gr bullets in their heavy 7mm loading. Most of the German loadings were probably with the 175gr bullet but I would have thought Bell at least would have been using Kynoch ammunition. I think even he himself mentions somewhere in his writing his 7mm rifle ammunition with 175gr bullets.

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In regards the heavier bullet loading for the 7x57/7mm Mauser/.275 cartridges, there is some confusion in this area too. Bell and Corbett were great exponents of the .275 cartridge in what ever moniker it may have been and in both their cases it is often said they used the 175gr bullet. Kynoch however used 173gr bullets in their heavy 7mm loading. Most of the German loadings were probably with the 175gr bullet but I would have thought Bell at least would have been using Kynoch ammunition. I think even he himself mentions somewhere in his writing his 7mm rifle ammunition with 175gr bullets.

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Rifles engraved as Rigby .275 Bore, effectively the same thing.

What does Kynoch ammo boxes say?

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There is no mention of .275 Rigby in any of their catalogs - or by anyone else. The earliest reference is from an American gun writer in 1970. . . .

Bloody Americans getting it wrong! Ha ha. Joke.

But this Stoegers Catalogue of 1939 shows some evidence of where the nomenclature came from.

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Not so fast. Who mis-labeled it from metric in the first place? ;^]

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The fact remains that the 7x57 Mauser is a fabulous cartridge, very balanced and superbly efficient.

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A classic remains a classic.

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John aka NitroX

...
Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"

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