If your X-bolt 7mm-08 is anything like mine, it probably won't be too picky. You might find that it will do tiny groups with lots of other bullets. Mine shoots well with the 162 A-max seated to max magazine length and RL17, and 120 NBT's with either Varget or Big Game. I wouldn't have any reservations about putting either of those bullets into the ribcage of an elk or moose, but I'd probably try a 120 TTSX or a 140 Partition if you're dead set on a tougher bullet.
If there is a bullet you would like to try, load some up. You don't have to pick the first one that's accurate.
