I have not shot the 25 WSSM but its ballistics are about the same as a 25/06 ,so with a proper bullet it should work but may still have a exit wound.
I use a buddys 204 ruger in a savage on a yote ,hit just behind the shoulder angling back. No exit wound and a about 20 cal entrance.
It was dead on the spot.
I saw 1 that he hit on the point of the shoulder and it riped a hole in the hide there, no exit .