Two things should be remembered about the 8x57mm Mauser (8x57 IS/8x57 JS). For one, todays .323" bullets must not be used in Model 89 rifles with .318" bores. Secondly, the 8mm Mauser will do about anything the .30-06will do. This, of course, make one wonder why cases weren't formed simply by running .30-06brass through a 8mm Mauser full length resizing die and trimmed back to 2.240". It is thought that few Model 54 Winchesters were built in 8mm Mauser but other than that, American firearms manufacturers have ignored it. Bullets for handloading the 8mm Mauser are available from Sierra, Speer, and Hornadyand a 150 grain spitzer at 2800 to 2900 fps is the right recipe for deer size game. A number of powders work here, including H4350, H414, H380, H335, and IMR-4064. 

This text is based on information from “Cartridges of the World”, Hodgdon reloading manual, the cartridge designer and/or own resources.