OP, I have the same gun. Mine has eaten everything right out of the box, except: some reloads that were reloaded with gold dots, and some reloads that were dangerously out of spec. I'd bought a mixed box of reloads just to see if any one of them would make my gun choke up.
Of a box of 50, I threw away one round with a cracked case. 49 left, and two gold dots failed to feed, and one cast lead round had a too long OAL, forcing the bullet against the rifling and not letting the gun go into battery.
Your gun should eat anything you throw at it. And break in is a Kimberism as far as I can tell. All things with moving parts wear against each other, usually resulting in smoother operation, but Kimber Is the only one that refuses to service a gun that hasn't been "broken in" as far as I know.