I just finished setting up a new Elk rifle. While I love my 6.5 CM, I brought a Tikka .308 and topped it with a Z8 for my Gila monster Elk hunt. Spent 4 hours at the range. I'm good for 425 yards on the reticle. 2 lines down & 2 dots down, I have the yardage perfectly documented. .
168 Barnes TTSX should do the trick out to 425.