Hi, mapsjanhere,
The idea of the rimless case seems to have been "in the air" in the 1886-1888 era. You are correct that the 8x57 itself was developed by the GPK and I was wrong in attributing it to Mauser.
But the original idea for a rimless case supported on the shoulder seems to have come, not from Germany at all, but from Col. Eduard Rubin, of the Swiss Army, who came up with the idea c. 1886.
Jim
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