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many of the tauscher rifles had a horn schnabel ,,I had a type k in 8x51 at one time...Paul

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I've never heard of a 8x51mm cartridge - most unusual!
Probably a way around the 'military' cartridge issue after WW1 (just shorten the chamber 6mm?) like the opposite of the 8x60mm which lengthens the old 8x57 by 3mm.
Certainly would have predated the 308 by at least 40 years or so!