No, the case is too long (58mm vs 57mm). The 7.7 will feed and go partly into the 8mm chamber but the bolt won't close.
So those German troops supposedly fighting in the Pacific* had to bring ammo for their Mausers.
*There were rumors during WWII that, because the "racially inferior" Japanese couldn't possibly have planned and carried out the Pearl Harbor attack or fight so well on the sea and on the ground, the real fighting was done by the presumably racially more acceptable Germans. That nonsense included stories of German paratroops captured in Hawaii and blonde, blue-eyed pilots flying Zeros.
Last edited by James K; February 26, 2014 at 10:59 AM.