With the 223, a couple of questions for you. What is the twist rate of the Kimber? And what grain bullet in the ammo? The reason I ask is I have a 1:12 twist 223 B/A that will shoot 32gr, 40gr, 50gr and some 55gr brilliantly. Same POI at 100m and all very close to each other, but if I load anything over 55gr (69gr or 75s etc) or most of the 55gr about, then my groups open from Half minute of rabbit to minute of deer. (Clover leaf at 100 to 4" at 100.)
It may be that you need a different weight bullet in the load for it.
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