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I also only found out about 10 years ago that there are two cartridges and that I now have a 12.7x70 Schüler and not a 500 Jeffery anymore. As a precaution, Mr. Ritterbusch engraved 1998 both cartridge names on the barrel. The size of the cartridge of the nineties differ supposedly slightly from the original from Schüler, it's the so-called Romey Hybrid where A-Square also participated.

Didn't bother me when hunting.

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Grandveneur, I forgot to mention the third variation of the 12.7x70 Schüler / .500 Jeffery theme. Before David Little of Kynamco messed up the situation for good by inventing the “New .500 Jeffery”, the Belgian-German gunsmith Harald Wolf, once publisher of Hatari Times, created his own experimental/wildcat/proprietary “.500 Jeffery Improved”. This version had the chamber and case dimensions of the original, but without Schüler’s rebated rim. Instead, his rim was the same diameter as the base. Here is a scan from Hatari Times No.5 :

Cartridges were loaded for Wolf by the former German custom loader Wolfgang Romey with Wolf’s proprietary HWM headstamp instead of Romey’s usual WR. The cases were made by Horneber. This conundrum of two different case/chamber shapes and two rim sizes led many gunmakers to keep clear of the 12.7x70 Schüler / .500 Jeffery / .500 Jeffery Imp mess.