CCCC, Actually, according to some basic rules of internal ballistics, the 8x57 is capable of about 7% more velocity than the 7x57 when using bullets of the same weight, everything else being equal--which means the same pressure, the same barrel length, etc. This may not sound like much but amounts to around 200 fps in loads using 150 to 175/180 grain bullets. - - - -
In a situation where differences are so slight, it is not my style to tell someone that "they are smoking something" or "you don't know what you're talking about". The memory says that the 8x57 case affords about 1% more capacity than the 7x57 and that past shooting/chron experience has shown that little difference in velocity with the same bullet weights. If your basic rules of internal ballistics say that the "capabilty" of the 8x7 yields 200 fps more velocity, so be it. My old chrono did not measure capability.
