Not sure the 7x57 is faster - can you share your source for this? I seem to remember the 08 always being a little faster in every handloading reference I can find. Thanks.
Reloading manuals reflect the fact that the 7mm Mauser has a 46K CUP limit, while the 7-08 has a 53K CUP limit. Apparently there are too many pre-98 Mausers out there to risk publishing snortier loads. The 7mm Mauser has a trifle more case capacity than the '08, so if both cartridges are loaded to equal pressures, the bigger cartridge will edge out the little one-----and a little more visible with the heavier bullet weights.
In actuality, the biggest difference between the two cartridges is in their history. The 7 Mauser nostalgia dripping off of it, while the 7-08 is only about 30 yrs old. That kind of thing is important to gun looneys.
