You need to have around .050-.055 protrusion for consistent ignition with all primers. Take it to a competent 'smith (note the word 'competent') and have it adjusted correctly.
I'd not return it to Kimber. This seems to be a very common issue with their rifles (not enough protrussion). If they don't know enough to set it correctly before it goes out the door, I wouldn't trust it to come back set correctly.
I know of several ho-hum shooting Kimbers that have been turned around just by addressing this issue. Just because the primer will go off doesn't mean the gun will shoot up to it's potential.
Hope this helps. -Al
