The 500 Cyrus data on IMR/Hodgens site seems very close to the 500/375. But I can't find Cyrus website it appears to be down. Brass price seems prohibitive I think it was 416 Rigby or 416 Weatherby?So may not have caught on.
http://www.hodgdonreloading.com/data/rifle?&CartridgeName=500+CYRUS&OrderBW%5B%5D=All&M anufacturer%5B%5D=All&Powder%5B%5D=All
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