Added to answer the opening post: I have pulled bullets from military surplus 7.62 Tokarev and used the primed casings loaded with different bullet and powder charge to get better accuracy than I could get from my C96 using commercial or military surplus ammo. I decided not to shoot military surplus ammo in my C96 because I have encountered individual lots of 7.63 Tokarev with higher than normal pressure and recoil and I suspect it may have been stored under conditions that could lead to degradation of the powder.
WHB Smith "Small Arms of the World" 1966 shows the muzzle velocity of the standard WWII issue 7.63 Mauser slightly higher than the 7.62 Tokarev.
The biggest problem with firing "hotter" 7.62 Tokarev ammo in a C96 is that a weak hammer spring or weak bolt spring or both let the recoiling bolt batter the bolt stop til the rear of the barrel extension peens, then bows out, and eventually fails.
If a C96 has springs too weak to handle 7.62 Tokarev ammo, the springs are probably too weak to handle normal specification 7.63 Mauser.
(I am of the impression that 1940s and 1950s commercial Remington .30 Mauser pistol ammo was deliberately downloaded to go easy on antique and war trophy C96s. For that matter, the Brits considered Winchester 9mm Luger ammo weak compared to British and German made 9mm Parabellum. The belief that US ammo makers downloaded 9mm Luger and 7.63 Mauser ammo because of all the WWI and WWII antique/war trophies is hard to shake off.)
If you want to shoot an antique C96, replace the hammer and bolt springs. I do not call the bolt spring the recoil spring, because the hammer spring retards the bolt's recoil more than the bolt spring does.