The 7x57 Mauser is the flat-shooting one the Boers used to give the British incl NZers a hard time with their stripper clip loaded Mauser rifles. Same with the Spanish giving American forces a hard time. It was the cartridge that put the Mauser rifle on the map. The 8mm Mauser came later and as with most things, Military adoption means civilian/hunting users largely follow.
About 4 years ago I went to a Weapon shop in Germany to look for stripper clips for 7x57 (for my Arisaka 38) and the guy, about 60 yrs old looked at me oddly indicating I must be mistaken, he'd never heard of 7x57 Mauser!
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