Hallo pinotguy:

Here in Germany the 8x68S is very popular by hunters which have to shoot on long distances.
The Cartridge was developed in 1938/39 by RWS in Nürnberg. The aim of the development was to become a cartridge which fits in the standart Mauser M98-reciever and shoots flater than the used 8x64 and 8x75.
For the high pressure they made the case-brass very thick. The older powders wasn´t so progressiv, so that the case needs a long and flat shoulder (like the .300H&H Mag.).
Standard-loads have 180-225gr buillets. The ballistic facts are between the .300 and .340 Weathertby Mag., but the cartridge needs lesser powder, than the Weatherbys.
A good choise for the high velocity would be the Swift A-Frame or the Nosler Partition. With softer, but very precisious buillets like the Nosler Ballistic-tip don´t shoot games nearer than 150yds.
Very long buillets, like the modern sollids can make length-problems in standart M98-Mausers.

regards
Manolito