Help ID Cartridge

Can anyone help ID this cartridge for me please. I have had a look at the measurements in my references and municion.org with no success. The bullet is steel/iron tipped. There is no H/s.

Dimensions are Bullet Dia: 10.96mm (.429 in) Case length:28.03 (1.099) Cartridge Rim 13.07 (.514). Thanks in advance.

IMG_4252

10.6x28 R Cattle Killer

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Thanks Pete.

Pete, you and the other collectors just simply amaze me!