in the old days 6,5x53R, 303 Brit, 375 NE Flanged and 7x57R (so 6,5x57R, 8x57 IRS and 9x57R will work???)
the Steyr factory alone on this planet was able to change M 93 Mannlicher on stock for romania in 1914 from 6,5x53R into 8x50R Austria- Hungary with a complete different clip. this rifles are very rare today but I had seen such a beast for sale in finland for the 9,3x53R, 7,62x54R would work too in this.