308 with 168 ttsx, looking at a sheep rifle that's light but also can take grizz under 400 yards, more specifically a brooks grizz, I have a 10 and 13 lbl 308 and a 6 lbl 6.5 creed, I feel like the 30 cal ttsx would be bullet I would choose even if I went up to an 06 or win mag, would you feal okay taking the 308 or would you bump up the powder volume?