[QUOTE=SDflyfisher;4163406]So how do you know if a barrel is rated for a bullet like 180gr?
Not quite sure what you mean by "rated"...if you're talking about stabilizing the bullet a 10" twist will stabilize a 180g bullet.
You said you're going to use it for elk so I ask guys that hunt elk what bullet to use, then go buy the ammo that's loaded with those bullets and what your rifle likes.