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Very reassuring to see that no-one reinvented the wheel when it came to designating the most popular European calibres i.e. 6,5x55, 6,5x57 & 6,5x57R, 7x57 & 7x57R, 7x64 & 7x65R, .300H&H, 8x57JS & 8x57JRS, 8x68S, 9x3x62 & 9,3x74R, 9,3x64, and 10,75x68; the junior of which, the 8x68S, dates back to 1939 or 1940! Ballistics were good from start, end-of-line users did not succumb to marketing temptation for new products each year and as already reminded above by Joël Dorléac "it's not the arrow that kills, it's the archer".
Louis

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Louis,
I thought the 300H&H was a British development - does it have a metric equivalent or perhaps I'm wrong???
I suppose imitation is the sincerest form of flattery, but virtual parallel developments like the .257 Roberts & 280 Remington in its many guises where very close to the 6.5x55 & 7x64 overall - half a world away.
It just goes to show how well thought out all these cartridges are for taking similar game & over what range these were designed for. All are very classy cartridges in their own right & really it comes down to more about personal preference for the game to be taken.

But yes Mr D's comment really nails it, all else being equal it really is up to the 'archer' to bring home the bacon so to speak!