People say it's about the same as a .308. WRONG. It's more comparable to a .30-06. In fact, it retains it's energy and velocity (with Milsurp ammo) BETTER than the .30-06 beyond approximately 400 yards.
Anything an '06 will kill, the mosin will kill just as dead. Keep in mind the '06 has taken (likely all species of) dangerous and large game on EVERY SINGLE CONTINENT IN THE WORLD.