That's a really stupid mistake for someone in the business to make. Yeah -- you can put .30 Mauser through later designs, but running standard .30 Tokarev through a .30 Mauser is an invitation to disaster. And it's not much comfort to me that there are a lot more .30 Tokarev chambered guns out there on the ranges right now because guns chambered for .30 Mauser and .30 Luger are very commonly inherited by people who have little idea what they've got. Those folks are prime candidates for choosing the wrong ammo. Really don't know how much of that hot ammo a C-96 might be expected to handle before breaking the bolt block and launching the bolt into the shooter's face, but some guns in poor repair might give way immediately.