This is an old thread but I found something on a new Kimber Hunter 6.5CM that I picked up on Black Friday. When I removed the stock I noticed the front action screw left a small mark on the bottom of the barrel shank. (Threaded hole goes clear through receiver and barrel shank can be seen through hole). Anyway, I filed .010" off the bolt and now it no longer touches. Last time out I had a couple groups well under 1" (best 3 shot group was .6). Not sure if it was the bolt or loads I'm working on, but if a long screw on a scope ring can cause havoc - I would have to believe a stock bolt could do the same. If you are having trouble with your Kimber, give it a look.
FWIW: Smoking the end of the bolt with soot is an easy way to see if it is touching. I like to light the end of a piece of masking tape on fire and use the soot. (Also makes awesome sight black).
A true sportsman counts his achievements in proportion to the effort involved and fairness of the sport. - S. Pope
