Mylhouse,
I load my 230grn. with a OAL of 1.240" - 1.242" and they feed perfectly every time in a variety of firearms. I also load using a RL550B. Adjust your seating die a little bit and run 5 or so cases back through the seating and taper crimp die again. Test cycle through your Kimber. Repeat until you get to the correct OAL for reliable feeding. I would not go any deeper than 1.235 just to be on the safe side due to the potential for excessive pressure buildup.
Hope that helps,
Evan
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