Here is the reason I asked the question: In the book "Mauser Bolt Rifles" by Ludwig Olsen, he has a paragraph on the 6.8 x 57 Chinese cartridge. Here is the entire paragraph: "The 6.8mm cartridge for the Model 1907 Chinese Mauser had a rimless case 57mm long and a 139-gr. pointed bullet of .277" diameter. It was apparently developed by necking down the 7.9mm Mauser cartridge. An illustration of the 6.8mm cartridge case was shown in an Austrian G. Roth catalog of the pre-World War I period. A military Mannlicher-Schoenauer rifle chambered for this cartridge is at the Aberdeen Proving Ground Museum. The marking "Modell 1906" on this rifle would apparently indicate that the Austrian Arms Co. was competing with Mauser for arms contracts from the Chinese."