Remember, you are using a 6.5. Inherently high Sectional Densities for bullet weights which equals exceptional penetration capability. Anything 120gr and up will do nicely.
Wolves, shoot em dead if you are not a hide hunter with whatever. Within normal hunting ranges 100yds or less (where in my experience 90 percent or more of animals are harvested) faster bullets will tend to fragment more. Ive never had an issue with a flat based hornady or sierra. SST, Boat tails etc. appear to fall apart more at close range. I once had a 270 win 140 SST leave a crater in the boiler room at 80 yards, dead deer non the less. But at longer range say 300yds i see no issue. My read on bergers is they are designed to fragment more.
If you are meat hunter shot placement is always key. Thru and thru with a broadside shot should be the norm for your 260 pills at any range. This comes with a caveat that you need not hod rod your loads. Keep within standard map and you will do fine. I believe Eagleye one said some time ago that 2800fps with a 140 is plenty nuff to do your chores and I would agree.
So for over all small or medium (deer, bears) game performance I would suggest a 129 SP or a 125nosler partition (2900 fps or so). 140s for elk/moose (ps, rem core locts may be an ol standard for a grizzled ol mountain man but this bulk item took a lot of game in the day, and still do if you want an economical option). If you want splat action go lighter on those wolves....and send pictures!
Enjoy your 6.5s, I do very much. My two cents.