Raimey,
That is not an 8x57R (360), rather it is a mockup of an 8.2x57R Hagan (AKA 8X5R Express). The confusion is caused because I made the mockup using an original 8x57R (360) case. This confusion illustrates why I prefer to thin rims from the rear (removing headstamp) when thinning is required while case forming from different donor cases. FWIW, the 8.2 is a tapered case, while the 8X57R (360) has a necked case. My H.Pieper "Rationnel" with German proofed SXS combo barrels has a rifle barrel that slugs .318" at the muzzle end and .323" at the chamber end. At one time RWS or their predecessor made two different versions of this cartridge: one with a .318"bullet, and the other with a .323" bullet. Adding to the confusion, the gun was sold to me as an 8.15x46R (because it chambered an 8.15X46R cartridge) but it turned out to be 8.2X57R Hagan instead. The seller made it "right" w/o hesitation.
Mike
