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.