The C-96 is a strong action, but I still recommend sticking to loads that will function the action and not much more. The reasons are simple enough. The oldest Mauser actions are well over 100 years old, made with the metal and metallurgy of the late 19th century. Further, there is no guarantee that the quality, such as it was, at the time a gun was made was maintained through its long history.
I have seen a couple of Mauser C-96 pistols in which the firing pin channel ran out into the bottom of the grooves in the bottom of the bolt; one of those bolts had cracked almost all the way through, yet the owner was firing it, not being aware of the potential problem. I have seen bolts that broke, allowing the rear end to come back into the shooter's face; in one case, the lens of the user's shooting glasses was cracked, with the only the rim keeping the lens together and out of the user's eye.
So always check those old pistols, not just Mausers, before shooing them, then use the minimum load that will function the gun. And wear eye protection, always.
Jim