I shot quite a few fox back when the only two 17 cal bullets in town were the 25 grain Rem and Hornadys. I didn't find them tough on hides either when shot mid-ship broadside. Maybe a nickle sized exit. When Berger came out with their 25's, I found they were about the same performance wise.
Now that Hornady came out with the 20 grain V-Max, I think, for me, that's still the best option going for thin skin fox at any range. You still gotta stay off the fringes.
This, of course, is from a midwest perspective, not a definitive, worldwide answer.
