this 500 jeffry rimmed is the 12,5x70 R schueler, a very rare german hunting cartridge with a very very high collector value. it is the 12,5x70 schueler, you know it as 500 jeffry, with a thick rim. no chance to mix it with a 500 NE, is realy a different round. there was a story about this cartridge in the Hatari Times Magazin.
think it have more power than the 500NE cartridge.