I posted this under the reloading section and attracted little attention. Perhaps Mauser fans only read this forum. Anyone able to assist?

I am actively thinking about buying an original Oberndorf which is in 8x60mm with .323'"bore and am told is proofed for the magnum load.

Have any members had experiance with this cartridge? any loads/? and can cases be made from 30' 06 brass?
I prefer loads using Varget if possible?
Also any idea on value? This one is original, approx 80% blue with a shiny sharp rifleing bore and made in 1934. It has a single trigger with one standing and two folding leaves (100, 200 & 300) wood is very good with some use marks which do not detract but fit with the age of a well cared for rifle.

Any advice would be appreciated.