I think this might help with some of the confusion on the caliber? I knew what caliber it was and thanks to Miletic I have more information on the manufacture and proofing of the rifle barrel. It is 8x57r/360 not 8x57, 8x57r, 8x57jrs. It is a fairly obscure cartridge based of a necked down British sporting cartridge. Not trying to come across as a know it all, I just seem to see some confusion on the caliber? Hope I am not out of line.

