Wahl,
Give the barrel, ramp, and ejection port all a good dousing with gun cleaner.
I had a similar problem with my S&W M59. Wasn't always pulling the spent shell casing out of the barrel before it tried to cycle the next one causing a horrendous jam. Of course it hadn't done it in over 5000 rounds until the first time i got in the simulator with it. Was great practice for clearing jams quick and under pressure.
I thought the same thing; maybe a burr or gunk around the end of the barrel. Ended up being that the extractor spring was worn out. I shipped to S&W and they put a new one in. No more problems.
Sounds like you may be having a similar problem.
Kimbers are a very nice custom improvement over the old 1911's.
The old man has 2 of the original Colts. We have to wear gloves when we shoot them cause they take big 'ole chunks out of the hand.
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