Gyroscopic Spin Factor (Sg) by twist for .25 caliber @ 1470 fps:

65 grains:  6.01(8:1)  3.85(10:1) 2.67(12:1)  1.96(14:1)
100 grains: 3.81(8:1)  2.44(10:1)  1.69(12:1)  1.25(14:1)
120 grains: 2.63(8:1)  1.68(10:1)  1.17(12:1)  0.86(14:1)  

Sg shouldn't be less than 1.4 (spinning too slow - will start to tumble) so should use a shorter bullet. 
If Sg is greater than about 2.0 (bullet starting to overspin), you may gain some accuracy by going to a slower twist barrel or using a longer bullet.                        

For it's time (1895) the 25/35 was a HV cartridge. The MV fits in with the 30/30, 30/40, even the 30-03, before it became the -06.

But, the twist rate was still quicker than it needs to be. I've wonder why it was such a fast twist, myself. The only rational, that I can think of, is that in the early days of smokeless and jacketed bullets, they though that combination needed much faster twist rates than needed. Also, jacketed bullets, for the same weight are longer than cast bullets and the 25/35 started as a jacketed cartridge.

All the above mentioned twist rates, could have been 2" slower, including the 25/35 and worked just as well or better. So, it could have been a twist formula that Winchester used at that time, like what ever you should have as a twist rate, subtract 2

Frank